Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3ac3416117ec80…

MALICIOUS

PDF

86.4 KB Created: 2021-08-12 23:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35e4b41c122af04664241a98fc48f261 SHA-1: 0140c9a5f78a6f6486c27a0ba11a240c769439c2 SHA-256: 0b3ac3416117ec80ecb76568599531aaad59618604b4927ad65fb75a664190ad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites and a link farm structure, suggesting it's designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/dodegoj.pdf In PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/xodizuzisinep.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3sdg9mker4950o81fs5q8ji883/jegore.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/16777679100.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/67355579650.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/358fb88dbecfe999847da94ee6051d13/6476350662.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1633a918---65691899502.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/50863790312.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zenerebupasusolekimij.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7004f4c790d14996c86837a64d1cd396/97625164441.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/7226214165.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb27a9874---kiburedojanufugofigukot.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d8c5c38d---wafibisepagibapug.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/dajozoj.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/70654309605.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/44acdee518f8c108bebd14e1e2da44f0/33554926783.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/48818661902.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ekjhdua67ofj772t742klh6qh9/26985920477.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/baginik.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6badb6319eed19e2f68d598b8e9daa2a/nokekutabetilorisezebeluj.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/85f52crcabq7o3shvtiak75bq7/ninuvi.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/bugorujijelux.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/85468484252.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a52327f35---dizolavusimuwovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=code+erreur+ce-41902-6PDF 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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10568 bytes
SHA-256: 23edf955f63bca3eed901915fda919859ce155d81bae4d217458e1d6f89754ac
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 18808 bytes
SHA-256: e69aae9a0aea9a5a4b3a9ece0ee5f62bc897e460fa29b1db6264d361fa091eac
font_02_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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