Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fb311220208302…

MALICIOUS

PDF

85.5 KB Created: 2021-06-29 08:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39aa29c6c77db033056af5ccf9e8426a SHA-1: 686c248ee066e1a7f56f93b91d54f0365bdb6399 SHA-256: 27fb311220208302364b9054b1adabd0983d29e461a8411d887fdee97f6e69e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to manipulate search engine rankings or distribute further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f827d59e3---xepisezusenetewog.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ah19f39u8qgjjd8rf97co7t8q7/22150787691.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/npjng248u2rogr6jq4cvhh2ec1/wajawek.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8f6bdaa2b261026d825c3179275b5942/37488850538.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b24eb478d---dizoxujubamulaxuvonemigo.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa26d59a48---roxamagebiretejivoveniw.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c179ec2cf9d---25711460811.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/319851dce24b75b0bd69d59879aa5ea9/jimureziwaxoluf.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c8c3b3e49---66266017635.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb053739a3---tifinuwavejuxanoro.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f894152e---dotogilonone.pdf
    • http://santeh.md/img/files/wudox.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/betutodosidajitomamuva.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160974d6801972---50072981750.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160935816a507e---49547395564.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/40f4f8af30425dfeaf58708d09f52dcc/14876836345.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2ca9b674eed337360600b635ce5bcda3/gejunudiz.pdf
    • http://mdfgiare.com/upload/files/51437371634.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2289cbf9f5de6955409e250d99a4351f/gaxutuwedivude.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a60f1e2b---40139884613.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/h1kkv25p62mvnshucev3q9gkql/xexivowawetupadabidutivug.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608998764bd1d---36783321086.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838e0557006---vakuvomeguviwolunitene.pdf
    • https://afayl.com/userfiles/file/sizojuruverokebajiz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dallas+county+homestead+exemption+application+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c0.bin
41ee29e05244d4ef68f462df3f09095b3cc94c65302fd144381d0d1c31f62bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 17164 bytes
font_01_sfnt_off000116cd.bin
16a208ea430d3048f4c0c875fd9440c296e29022d2f97bf2f6fcc21ba318f93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 10996 bytes
font_02_sfnt_off00013038.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 16792 bytes

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