Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce7c811780a3a2d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 07:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 289789438b98855a4976e946c7a5cc77 SHA-1: 96ca1088f074cb64b8f73b084c0b52ba2ec83054 SHA-256: 8ce7c811780a3a2d6d6012179f812b35afcf5901db8111a6af3b52207e992464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, some of which are hosted on disposable domains or use URL shorteners, indicating a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=c%2B%2B+questions+and+answers+for+exam+pdf PDF link annotation
    • https://onderdurdu.com/upload/ckfinder/files/jazesaviwufavenurafetoro.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de64c667b7---momapigobiduzil.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ec5aa2ecb8d87b46d159f2de6f04a9b0/neragane.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/fuxijux.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/gegilikofakamuvalokemaxox.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/80914992343.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/baruz.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/dabojabiziju.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/52277330774.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/merirerakajiwi.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/99045374466.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sijugufelugediruluw.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/45311365420.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/41653364884.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143ba71d9449---netimajinibebufurase.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/39976216648.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/r90735rsmpjtsb4rmcgkq4srf1/20153785277.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/83471229921.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c4e396d5---munulozupojewukotepuku.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/guzexa.pdfIn PDF document text
    • 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_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 11076 bytes
SHA-256: 9989b3163e118f85718487c6a7366247518d2a295be9f60befbd70d3d87132c8
font_01_sfnt_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 18300 bytes
SHA-256: 80dd13d6faa8dcf7b7060dc09b09d3e7aaa97b19e660f89d517e4076a1d6090b

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