Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b01e9b7aa3c6ae5…

MALICIOUS

PDF

91.1 KB Created: 2021-07-13 23:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30cde82926eb364e426e3723905ed991 SHA-1: 2e62b4384fa898efe7993539317d1d94d2af7b63 SHA-256: 6b01e9b7aa3c6ae52fcc26f4e3dbeebc28caa40ab14c59d1a8dcafb8dbb76751
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing or trojan variant. The presence of a link farm on compromised infrastructure strongly suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4df6f714---pubaduz.pdf In PDF document text
    • http://allasclub.com/campannas/file/kawej.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45f8b60f0---85201394208.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddeb16128---xodakapukozikuge.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n9lsquba4r818d2qns39rsghsi/48482499879.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/54238777525.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/6f940e4e2c7193436cef995db7c7fac0/bagipidujuku.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/72213281341.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/341ae1b2a5bac3ad03023376d57fa93d/jezasovulute.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/fulovukixexedevisogizen.pdfIn PDF document text
    • https://slide-bearing.com/d/files/94635933179.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8b920cae---66120275619.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/71f5bdb08e6e36470a7d7cd8f06ee5b1/77234050697.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e7e7645921d940619ee4af43a8190b03/16708372499.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/91298675810.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/010d335204eee80381aeb2d01de9286b/79901169542.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k692nbhsgh72gosp1lc9ktfjf1/45587472761.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a3f8610c---boxewuvu.pdfIn PDF document text
    • http://grupophi.es/uploads/files/43555499278.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607023672205b---90494185972.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3696030f2---68780319945.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069cca804d---50861331212.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/midesiwiwapiluto.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b0f77458---razenivatizibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=measurable+objectives+for+a+businessPDF 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_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 10760 bytes
SHA-256: f20c22016b002dff21e725dc5d22021f5756019de7a15f8a3a1b4a4975fef163
font_02_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 17992 bytes
SHA-256: ce2a58b7e600ab1531c8414259afeff95dff34270710f47892612a87e912f3f2

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