Malicious PDF — malware analysis report

Static analysis result for SHA-256 a766f9cf603c1dcf…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 17:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a9adfe395913b1af3e651df5cf6abe64 SHA-1: 5fc74871e7ab53e6c5b300c3a7742ae2cf683e20 SHA-256: a766f9cf603c1dcfd4d49008f69398bd48397e28c52ad1ac0adb4d304bb6077a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://akinmedical.com/uploads/file/19784944014.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8iubg5jqghs722i8j7kskib6i7/26329408731.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/52dcdf3b730d274ae3d2b98228f6d693/47970300316.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/4ecbe4c27240bd00264339e8d6e42604/womododefujawubiso.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/riximezewumidipive.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b68b42808ee4fa9679a357d53e0d132a/tebakeweneb.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910fdef059e---voxuninogubozanaxewife.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f3da82b2c700e67ad8ec143d4c277c8a/pujesomadusugimono.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/gobadosaroga.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ldhooupg6jpe2mvcpdp3akg6v3/kinuxijilofepafuripokefo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9544e476---jimifi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083b684e27d1---tuzinoladaxul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe6f628814---72144054276.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d1dd66d2f---98089600218.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xixeberajefifizoferelutu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/92898473371.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/raxasotidixor.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a110a8bd1be---64164091432.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b3e3c89fd72e8b96b11d5cdc072a96bc/jaluxavubizivokigugu.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/debixezaxekemixegadipiz.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/674bf590d55afd4fc1a02a475dd2e358/sesizutezoxetupoma.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607637193704d---35258906793.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/187e48fcd29f86c5ac6643dbb6b9769b/gipewovifelotonig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ipl+power+outage+map+indianapolisPDF 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_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10872 bytes
SHA-256: a1b40565a9379a25337331f73c960a4c87081f5e0dd99b552f67e7f106edcd38
font_01_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 16772 bytes
SHA-256: 1dad2d0ec2c246d74d3932eda07481060d02c79b3b52fb6847119170a140cc56
font_02_sfnt_off00013f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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