Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c276f1f4586b879…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 01:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0b8cf31e7bb22083244dc8f742c21cd3 SHA-1: b0853ad18b768ce6bcbb50e98666a4092a78d0fd SHA-256: 1c276f1f4586b87905b8743d160b7f14bb715c5495396f294738cc87309455e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier output strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://archism.ru/uplcv?utm_term=how+long+does+raw+chicken+keep+in+the+refrigerator PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e82421c5---gubaxalunifukopun.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e4068db8---89719090283.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59a6eacf4---34113538337.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fcf947022---93971509811.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36b1d48a9---41996488351.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8ba855d62170fa004be87826e95a0ef3/nijiwenenele.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7d9290503d4f5d1bb01900b581b649df/desikexepuwidewagorawupug.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c4256bdd65d83e72d6076cafa5f6dc55/59312213449.pdfIn PDF document text
    • http://midel.me/userfiles/file/82391718772.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kodudizutelof.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5a4c831---70401719403.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c54906a0---1601510409.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a008b237a9---9817749928.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/82864030501.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/17236870165.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/51231828576.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rexedisiguson.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/56989664838.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/lasapolujunazesok.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/ddab3486688a3e4037a7efc17c95afbe/46529322685.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/60281293608.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/sevosudolazejifamono.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e142c603db---75616775804.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kqtfmc6v5vab0cehhj57q8qpnf/majibuxuso.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0dc1f261bc1359129c79fed552f191fb/kusufiw.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_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 17008 bytes
SHA-256: 578da8bd7fadc62059223a76f260134ec32745fd68d07cf3dc5e0c19329c8c4b
font_02_sfnt_off00014276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14276 11068 bytes
SHA-256: 3634ad25e537f698e6ad419d9b85178cd86b4045a83ec5663b1e098037ab4b9e