Malicious PDF — malware analysis report

Static analysis result for SHA-256 c718c4005ea3b54b…

MALICIOUS

PDF

81.4 KB Created: 2021-07-23 19:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 94d9ce954c3f046ee8a2eb22e92855f8 SHA-1: 4c9c7deb9ffec1a09cfa4c6dc6a800704aface53 SHA-256: c718c4005ea3b54b4717aba6f9c68083706ea6b63543b16393d0dc429ea2675a
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the final destination and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dabaizhongxue.com/upload_fck/file/2021-7-8/20210708115722868275.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/iqapo01eqt50nso60gbntj9ove/tisebupuzimotavaziloripo.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/44740243184.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ba2364d6ce9a73b5d998c1ba17454b15/64232187769.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/xomonex.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/53119744272.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/15f291da022d1c0e60b4b67abf359e3b/79629460397.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4031c66e0---fipemuxil.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7ksc8jqpl9cv9sah8krok87g35/86136750434.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f934d07e---1234220170.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099718e5db00---sovoneletaxidogopi.pdfIn PDF document text
    • https://biocoils.com/img/file/kudil.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106091430214615.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/fibajivivebipafoxaxa.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c856e1f68---taxam.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/xetekodipubolikakujowugu.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/74805551116.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/piwobebasulebojuvupejebu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/8837084079.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d291c1875a00873c89e3d61849b7c08/47797377501.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6708e44bc---kavufoxajoxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=weathering+and+erosion+activity+sheet+answer+keyPDF 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_off0000d94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 17324 bytes
SHA-256: c9a31f923c8dc0e89d577b7ae851ea730e21d4466b0467f66303f15c0cc8c91f
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10952 bytes
SHA-256: 938e6f0b5341a8debc291bfa164012fede5ac59e83ae2821e958a91755ef8314
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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