Malicious PDF — malware analysis report

Static analysis result for SHA-256 773350693d20a3d4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 13:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e81215180fa1ec5c51f12894a95b854c SHA-1: 27aa70643096a5e6338d63823d00cf8fc0f18e94 SHA-256: 773350693d20a3d440757f07cbe3a9d34fd64055837db086efbe90342392989d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a callback lure, prompting the user to call a phone number for a fake issue, which is a common tactic for scams and phishing. The presence of multiple links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent, likely to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user trust through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://associazionemusicaviva.it/uploads/file/taxumigozevi.pdf In PDF document text
    • https://palcev.ru/userfiles/file/runevawozasoj.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/zijemorisedixinimisu.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/55503204440.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/41510750597.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccd7ae524---5194730795.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394229f0342---vedorosowilumisod.pdfIn PDF document text
    • http://szpk.hu/_user/file/welapowowubo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132486ff2a5c---sokenedipetek.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/nuwasorotigaf.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/35715831383.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/17869635726.pdfIn PDF document text
    • https://rm-parketi.si/uploads/31856565149.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/koxadubutare.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/67fd51d365f3a543e5ed1b8a9ae2118d/59948146097.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/newizaled.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/27c7880a85a57c65951f52cf96417197/14525220420.pdfIn PDF document text
    • http://pvvc.cz/files/12984910513.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16138fac1196c9---82202455304.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/losomasutewu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/wejifetenuze.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/54710034731.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/bavadasuguxisiropefuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=control+your+android+from+your+pcPDF 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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 17752 bytes
SHA-256: 84e2a1329c903865606c12201abbc34f2a57a57eb799017b520e4bd71f02a06b
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 10724 bytes
SHA-256: 57ee7538a4978fc2c15f0a789ede6021ef0e0c06eaaebbeae18bd43c1c5071c6
font_02_sfnt_off00011fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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