Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7ef455e6853944…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 04:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8ad498ac86a008527089f78edd3ea97 SHA-1: 7036464677677ee7ce3712c783260341a5f78f64 SHA-256: ca7ef455e6853944ecb4396127a42bc85ac95a030428c6706ae75a1c00bffb59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to distribute further malicious content or phish for credentials. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of a malware distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.psoealora.es/ckfinder/userfiles/files/kerimasirulijeladisebotuz.pdf In PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16099be26ab83d---xuwovif.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161134808b592a---xevatojunitaleji.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3dmpr8q7t00qjllrgcoqkjl6r1/17771059656.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54a5a6419---63031655618.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f8fe25e3---50176773316.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5da8a1c85---52753226112.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/44014590887.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2aef8mqom7etmplj670c3hcnm4/93073808038.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/mefazexudarajupaxadadaze.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd3fb6b436---soxiwirixatim.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/tifezenisorureburazo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fb9e1207d05e9ccfd788e867a78f36be/vivadekugikifilexob.pdfIn PDF document text
    • http://lulanjina.net/upload/files/kaxekujutawo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1fc820f3---30131310184.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/37001117503.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/k79uc1trmc66jm6l5kl7na3kbu/39804187549.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/78178443275.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630370653.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/42231309195.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d6fc52a9f1dad6ebd1ee649ea56e5bfa/6421294159.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f2784df2---51678766950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+surat+al+kahfi+latin+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 19472 bytes
SHA-256: 2130685689bf81fcfbabebe13d3358bbc13880f59aa11fba111a372402676055
font_01_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 10744 bytes
SHA-256: 6b768a84d9035a656a0d54bb04ec2d91ce66d3ec972f7b4048d84ea375033905
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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