Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c93437b7bb5b1c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-11 19:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 668effa526319fe972be626108f2b830 SHA-1: 380b777da3d63cef90f1f31fa99abae65202386c SHA-256: a1c93437b7bb5b1c8042e15a0e8821c73dbc93a60f343f93ef0e2b3b2c2dfcbe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting it's part of a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number under the guise of a support or billing issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://allytemp.ru/uplcv?utm_term=after+series+book+1+pdf PDF link annotation
    • http://mobilenmr.com/files/files/69127642988.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/11530513029.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/temelajawonamabitugaxoje.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/musitodivivuvubenutoza.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137366add8c6---luzamikeboj.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/lasopumomizajisevoneneg.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f772e25cf---gesefuvukokosazuxub.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/dexorisikajexifowupawuget.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61822117344.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/75233250399.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vefogirel.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77960516426.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/xanazejow.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/99116909291.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/fuxojonobexofinifijidugub.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/74873958939.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f6708ebe0a4464fe331e2da062e1af02/52198592641.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/jetabomurozologexuj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d573dab39---55210894372.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78431734393.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/81663780532.pdfIn PDF document text
    • http://master-br.ru/img/file/18008205106.pdfIn PDF document text
    • 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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 17604 bytes
SHA-256: 3a49fc8f9eff8c4e5dfeb8e56d943587672090f8a2d1ae931a19a4606a17e8af
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 10444 bytes
SHA-256: c8cf0de2e76e33d2327aabb6b2a2e56bc81880b6e4c28a2c1f7d6b23034a1c80

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