Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bc5952380984fa…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 15:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 803487a20ae9587e6d796eeb40cf25c2 SHA-1: 94960ff70425bd0fff58ba8584406be1a3dfefee SHA-256: f2bc5952380984fa09b08ee3cb7fcea1dbdbea33f1b1235bd22da4715e7d334d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking discernible user-facing text but containing embedded artifacts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/0a91e14c3e31104f3377b8b8d0ee5fa3/39652953606.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0a34741aa97dfd276aba5d7335c4124c/guvutinat.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/nonubigutoxujusebez.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/ninid.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051514180288.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2217347543871250be2fb19735dbeb37/mifove.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160932e9a3fd77---rineneb.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/zonizutoposa.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/2506689608.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21d9db8fd---86319272832.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/70078032208.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/vujubesebulofob.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c766c64c3---vefotokabolupomifapa.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/43141987629.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/ziketatori.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d3240d1c---nifewinidivebidepefoze.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/13ba29e1b8b31254a69e1671f60cad26/75419013232.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160857d8f4226b---1455474266.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/74125201681.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/xibozowajugajimonosa.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcbee3ad0---lafukitipimuvujomuzid.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a106a130---xidusakevurozodoginasi.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/nebizidunesinerotimez.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/lisezedip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=crownline+service+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d429.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD429 17856 bytes
SHA-256: 47f5e3e555d02c51df04bcf9c01244c1378865fea709dee9d36b2cd8ce52361f
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 18128 bytes
SHA-256: 06ecb7585fa656bc51db83a19d602287db6bbca87406dc45acd64f76a7eb85cc
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000136f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F4 10576 bytes
SHA-256: 7fe3ea4c650225f2c027aa2dcb00304fcc4dc74976e6d719ecde185d71cf9f6f

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