Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9a40c45e515b6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 15:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d244843eb3718e237aba5eb496af5c94 SHA-1: c5d69a24d55b8173088d145b8edec45e951c0609 SHA-256: 41d9a40c45e515b6e425def5a52fa39b836eb85bff1bfbf8dd53ee1573261a69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145390a3ee23---57249791135.pdf In PDF document text
    • https://topupdana.com/contents/files/62479846829.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/89852d8a7808096dd712e11cdd62fab2/20147358970.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/70662051500.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/desakokuxinipemepanesilu.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/fefukepoxitexisix.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614452587a0bd---saduverolegukuf.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/8861075561.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/51344732440.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/16253727941.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/94297217294.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4a7c1b43---76227234915.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/93794576308.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/98509053115.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/gadusodulikulegeb.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/34580805927.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/timagosajerel.pdfIn PDF document text
    • http://negaratoto.com/contents/files/gomigowodutogilako.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/44738345286.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/vusumilewovugel.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/20796848653.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/wizupevevud.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/gasidetorotojixofu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/nexobeguvujabubajusaram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+house+of+the+dead+game+download+for+androidPDF 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_off0000b3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D1 15572 bytes
SHA-256: a9c2fd0282604460f9422d3f8c9edf1038a53f1066f93ef6163bf9696e7fd512
font_01_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 10948 bytes
SHA-256: 1b0fd0f0ef021e7a1138b75869fcf73c3bf7d5a6652f593c73b8ad627c581da8
font_02_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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