Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb243bfbfd32f18…

MALICIOUS

PDF

79.5 KB Created: 2021-07-29 09:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4cb4d6701151f4d7fdef0ade2d993fa SHA-1: 998638a5f0bd104091838e7ddb6111850949b729 SHA-256: 6eb243bfbfd32f18b3a2a80a3c637a300def95fb821bbfde55cac40a73ee6d10
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations, suggesting an attempt to direct users to malicious content. No scripts were extracted, but the structure and URL findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.plain-pied.com/editeur/ckfinder/userfiles/files/jaximizupobog.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/nn14hm3qpoavg7g56596gn9pkn/sutopiripot.pdf
    • http://pytextiles.com/userfiles/file/viwomasobaboxes.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/biidkabk4i51dhu7aqeuvlqofh/kujobokoxab.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/u5bl47l1gnp32ig8vfqe0d17k0/fipidakugasine.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/34261aea6eacf6b827539c1fe0df9ec9/tisaj.pdf
    • http://adria-ex.com/images/blog//file/66781659431.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db41c401f4e---pexenuf.pdf
    • http://sitoad.com/bbqjoekey/files/202106271723508954.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3131869646---8147888203.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6da422fc67d1c6fe5b951d5e10adfbd0/nubedotaradajubibarega.pdf
    • http://mea-travel.pl/userfiles/file/xilotagaziw.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607310bc00946---56065459464.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/nr1v04qta0508qt210it99dadr/84878806105.pdf
    • http://colafranceschi.it/userfiles/files/12025900959.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vawakeruwuxawora.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16865ec2be---76191636205.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/72912565700.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c7b6ea2b5daa2189a0db927e5c2f11de/51252608091.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd49ab410---50980474804.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3c41692f---zijagotoduxixivuj.pdf
    • http://penzion-u-zamku.cz/files/file/josavobusisodagemi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=que+hora+es+alla+en+argentina
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/286dec75609acc5d61e9698578872374/rofopoxud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4a.bin
e2e122af306fad7bdd4effa0542e48c4c91a6cceb169b8a2e7fc27b8fb225122
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 19068 bytes
font_01_sfnt_off0000fe99.bin
529f062492389a565dea43002029818902ad23c9f0d186213b68145ce9b2e120
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10544 bytes
font_02_sfnt_off000116ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 16792 bytes