Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf95571befa3244…

MALICIOUS

PDF

112.9 KB Created: 2021-06-20 10:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c28e4b52d819d59fbaae9edcb2d75c4 SHA-1: d3bf6addf105e048c11bf26db264d5066f0bd25b SHA-256: 5bf95571befa3244067ac5e63b8dbf95c9a79b687eb99e1ebc521e653c4df861
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=gunship+battle+lucky+patcher PDF link annotation
    • http://szolnokepul.hu/userfiles/file/1428493706.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f1843df0---nazemiwitemije.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/timalipojata.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/fuvekesopujo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3f39126e---59708910507.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4513cb58b---87209317222.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868c23c8d46---88763305556.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/iddb84to9mcd19emgkvl7vqq3p/74928494033.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df05c89188---fovazaxoxifenomu.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/worawetolesopeze.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ef51e80f79d5103d5d8b4f2cbef79f67/83174573678.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d91b39f6d633ea75d17fde472f6611dc/bowatudumadeko.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/06be1m0jgf2n9pmfeas698j0ii/xajefadenubireribavomul.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/0dbf3719c4626f59f2a1eb38c605dac7/92115552355.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bce98bdf2---padago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00019170.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19170 20528 bytes
SHA-256: 85de9ccadba1061f3e5545fc1759a146ad64f8076ab4977a41eaf49ee4587fcc
font_00_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 6872 bytes
SHA-256: cfd810a5ea282119da4c1abf509a1e6bf8c77e42bfdbea3e308bbcdcc7c40f73
font_01_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 3220 bytes
SHA-256: 014802acc4bdba616d216214db9e26669e2236fed4f404d49d62591e68758ece
font_02_sfnt_off000131e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E6 5360 bytes
SHA-256: 1b141bbf115e7e811caddec2120812a17e2737e3c0f9a4e24bd712e3434d18b9
font_03_sfnt_off00014417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 6820 bytes
SHA-256: 41425259865a86bbfd893e19138b9afae9f0bc5f73eb8a29e2048b14c1320d28
font_04_sfnt_off00015bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD7 17824 bytes
SHA-256: a5832bb9d01449152a718df4afc8f4fd8cfb84c5dab0be46075aef41752cf1b9

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