Malicious PDF — malware analysis report

Static analysis result for SHA-256 140b854ca346a4c2…

MALICIOUS

PDF

121.9 KB Created: 2021-06-17 18:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f2ec8d5679ec90174e5a6d0953ebf4ee SHA-1: aa44ec77c3d16ec9eb251237e690258f8c35b7e5 SHA-256: 140b854ca346a4c29297a868ee66c055ba028017266174bb9f33f85f388ca7e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to disguise the true destination. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7633a663a1aa1597321dc8c07f9d141f/peluvevurukuw.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0440eb537dce91b9a53cc495b5e6b93a/vawidofidupuzujipufegurab.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ed8c69230---jefuderafisufopaf.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609be65114a80---89149846810.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adee28eea28---pevitevububixakemel.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7e439d1af9---2019338937.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e3e72436---35068802951.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/veganeberubukijad.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607219c0dc5a4---30486781231.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6eddd9b6a---xogomarutofevokerutokunib.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/of0suagre8t09li95ko3ccpid4/82848001538.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c93941a85---dupafubawazubu.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b9a1d58a---10842876454.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608168f0e7df9---16018599003.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075e7f40ab9e---6149536211.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0c97954a5ec0be3611b51d7fa77855c6/74793282918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fast+and+furious+7+download+worldfree4uPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001b30d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B30D 20856 bytes
SHA-256: 490dbe56e62e5c813d3e5c1a3a8675ce961ed32a542667525e838952809a56ff
font_00_sfnt_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00015695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15695 3008 bytes
SHA-256: 88a3b262ce7652da3266f37b220d52e10c2c58d49b612ac326704e2379ce07b3
font_02_sfnt_off00016129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16129 5116 bytes
SHA-256: 03ced7888d6e9381b1e60034d24cf78868b1ea0fa2f901208452b009d4cdd05b
font_03_sfnt_off000172bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BD 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_04_sfnt_off00017e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E18 1704 bytes
SHA-256: d4ed4897cac276ad8b4432568dbc6a6dc4e77cab6327dc0d74daf3897b35b229
font_05_sfnt_off0001869a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1869A 13300 bytes
SHA-256: 0f855fd517c061b8372c13a7e33ce33141ae3c7b094ae90d399a5fd6294dbe0e

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