Malicious PDF — malware analysis report

Static analysis result for SHA-256 527d91915778f838…

MALICIOUS

PDF

135.6 KB Created: 2021-07-19 06:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d80801a5bf9361b3ac242d6dcfcbadf3 SHA-1: 93013d9b37bb20eeae05fafc081d1cdfd944a3ec SHA-256: 527d91915778f8385aba7ea3fba5300b08ea849891ae7d988c29e44f5b4928d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of numerous URLs hosted on potentially compromised CMS platforms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3b44798d---54220718322.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094385a0b475---lanunepetijobaj.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/83896897692.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/eb7ab5a67015c67be0343ef7a5234f26/fiserilibawopeg.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/18898058339.pdf
    • https://ebooksweb.net/files/file/gixidagef.pdf
    • https://bamfieldrental.com/userfiles/file/xewexe.pdf
    • http://wefocusdesign.com/upload/files/jekemunepirali.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/qqognf28ub1bcdhvvgj1hnavjb/fifokexok.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5758cbb2---mutaf.pdf
    • http://ajisushionline.com/uploads/files/46190047456.pdf
    • http://thehigh86.com/clients/13680/File/82017859606.pdf
    • http://ozona.pt/wysiwygfiles/file/mumajepukobaginafan.pdf
    • http://khangvietdn.com/uploads/file/magovojanejexapane.pdf
    • https://mimpishiosatu.com/contents//files/56176741505.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fanubexokap.pdf
    • http://thuephotocopytaihanoi.com/upload/files/49871615093.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1afa65915---sazituvoniz.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade5f2de16---ledixegabixotakoguga.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ed9ab7d9---86105870414.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=and+your+name+is+jonah+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b031.bin
e43fc79550f250f17932277ba3c3a21150a031e19ed6e7b9ed26e19b9511a820
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B031 18472 bytes
font_01_sfnt_off0001e053.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E053 16792 bytes
font_02_sfnt_off0001f86a.bin
b400be52a1ba80582d721c2d1ad80c2d143f9f9f29f71458bc2d79fa9513a9be
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F86A 10760 bytes