Malicious PDF — malware analysis report

Static analysis result for SHA-256 a960d1e4d8c8846b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 20:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02d9c75aafc62625c671cf3569068e9a SHA-1: 27d017a718f5067ec3ae817edd09c0ac5b7ee2fd SHA-256: a960d1e4d8c8846b79bf5d8706e3b72d10f6bde1fcc595821f6e9d60140d2f05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/408736a473a6553ae6edd36524480d3e/3424029864.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1f295196149cefb214c8a84da41385a1/sijogunakujov.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2e40e4fb8d8283773b181984d018c42d/wefifetopiborexurakimufuk.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/rizejolekajubokuwaje.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cc3ea9492e021067283648a32b0180cf/revipifugafuwejiv.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/g2j678mm7sbl2bujnf46qlpknl/95117924156.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c17181f5d---fefowuresodezetorifol.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54a4932761---vunivalotuwo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/75687704818.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/fuxolewebedisonodu.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210625031743.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/43582903806.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1a58c1ebf8e0f1f765a6386d2aa4d29/kixolazujuxixekofifeginu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/db01228b73a1c4f9f80ee867f4fbe502/nalife.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bb933db9---90610790478.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2gn75mtd3l2gv6v0fsmq1vqnac/tixenol.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd26084592---20389778564.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///paxabelogetefepikeri.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/pojod.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072badb37b1c---kutabibezef.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/40iu094edh826obhcfbb56gca4/25941232025.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/werutajenal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=happy+paws+dog+groomingPDF 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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10648 bytes
SHA-256: e7851a19bbb28daec14a0f1bc05d40d6f508ec1d42c9cd8122b11bb74cd0b7b8
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 15964 bytes
SHA-256: 4cfed4f37e62fd7bbcf275cbfef56ea6d08f5cac77f1876ca529aa7ca1e1b4e5
font_02_sfnt_off000138ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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