Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16fdb80c7fb5260…

MALICIOUS

PDF

117.1 KB Created: 2021-08-11 03:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3fc1cd4fb5a49455f00e033c9545af4e SHA-1: cce24bbd3cad10af6fd42ae4e3e35b376ba35e62 SHA-256: a16fdb80c7fb5260ac7bc41a526c79a5ee22fde0fdab580acb39a49917439b21
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, likely for a scam. No scripts were extracted, but the overall structure and heuristics point to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://dakhoanhanai.com/images/files/31628271854.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608394c7b80fc---47695346499.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/5586963726.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df37240d2c3---libejedutunobigifujule.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/71289722322.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/45458991236.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/10384840311.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zanaxirudamizozagu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/lixamulimuripunejesega.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/256vmcpofkcuskfdh1gck6fc9d/46761843666.pdfIn PDF document text
    • http://stl-hk.net/userfiles/topidenoj.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/maselirevawo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/zovutuwodijoko.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609144f6a7fd6---54780655574.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/82951905457.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/31652464155.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/542b2cd4c971b89963d1bbffb429df87/84642744233.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bbd3e254---74528843433.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070109b1e445---kakuxekujasoxewaxeja.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/gatuvopebupukafomeropomu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/vosoximujoxomurasepanupa.pdfIn PDF document text
    • http://calisnt.com/uploads/files/donosarufojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=interstellar+full+movie+download+in+hindi+480p+filmymeetPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 11488 bytes
SHA-256: 2d74ca43ece42922ca4ae6883f88e81fc80ba06b1d2208f396de0526ea27331d
font_01_sfnt_off0001574a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574A 1932 bytes
SHA-256: 78b0a163e4eaea4fd1c276a6e09b3ffe8714eb7cdf5cd8e6d31ca7f4d18684d2
font_02_sfnt_off0001602b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1602B 17196 bytes
SHA-256: b4e3abff71288dc36edca2e1062bc60a1132078d726455a4226c14ccd47fa2ca
font_03_sfnt_off000179ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000191c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C0 19484 bytes
SHA-256: bacb023923cb667abb8ceb4b1b966d849b93b1d9afb8fd12d14c77edca92de77

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