Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb71847a7627950d…

MALICIOUS

PDF

90.5 KB Created: 2021-08-10 00:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a0294811fb79277487ed8893ee0f7c0 SHA-1: 05d13efb988fa99b56d1d7980009a1b2a001f813 SHA-256: eb71847a7627950db0a9ec1772a0befad88c51cfa3fa3403c905eb35ce3d6f9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mg001.cn/upload_fck/file/2021-5-10/20210510065520998996.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36085594b1---2858955820.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/01c37a7557c5d5bb1c56fbe2dab4f003/nidazikag.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6129c7f86f41a23c1ead6e68911ce12e/penodomuninezujukodipasip.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/22438122906.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/vogusizisalixom.pdfIn PDF document text
    • http://axwelindia.com/uploads/62327587771.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/razigumozil.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dkp87oh7r62j1rma9oobon0nnu/kizesenolijimijesuberisa.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/90956904182.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/liluwabimofenanomavuze.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/nonorasakakageref.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/61644783532.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/tuwaponebinaboval.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1b660ac9e82b43dfc43b6ce6372e3a18/57307677958.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-14/20210514071127933686.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g6mg129ecgfer8l4rlmliolvep/51117056274.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/jowafiwezemetu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57d06d7b8---puwerelur.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/wedidufijoma.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/jpfc3ek347ag1cv3nj6ik1hpt3/68784686653.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/78437564181.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0e815289f3dff3a322f8799585a0c49a/37839650506.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/76319427880.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/60684970753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=modele+patron+pour+scie+chantournerPDF 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_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10704 bytes
SHA-256: acb0a38fb26ba0a9863cb4796ea222740a37267980bd7cab9737c1eb2da24f5c
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 19108 bytes
SHA-256: 6167306da696e14cc8ec1bed6db3251d12e4b9d9735b4198f628250c03ecf47a
font_02_sfnt_off0001411f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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