Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f93ccbad2429036…

MALICIOUS

PDF

68.1 KB Created: 2021-09-06 23:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80c75e14f3d6f5d209750c5b8606a357 SHA-1: 0ee6375032ab8e4cf637e8542d4f3224bb28882c SHA-256: 2f93ccbad2429036a4d97fd630bf78335966724e8b4b671f49477c2a255052c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as a phishing lure due to its image-only content and embedded clickable links. The heuristics indicate it's designed to look like a document but contains a hidden trigger to navigate to external URLs. These URLs are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba07b7abb98---16923611249.pdf In PDF document text
    • http://ainut.fi/userfiles/file/ruvunakifiromede.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/dipewidikukokujepimiv.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/sodakazimowumotubudiz.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/24893825903.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f9ece05d0---25148623649.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/93821316172.pdfIn PDF document text
    • http://universe-micro.com/upload/files/20210703_205415.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/75965727228.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/gapofafugage.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/87500612419.pdfIn PDF document text
    • https://goodline.by/userfiles/file/ririratirolinogufabaj.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/nhcmconmchq0teiver5qbr0f16/sabed.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/13a086d2b5d93fcfec4ebd1f27984c5d/70892664401.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/94e6736170d3269f64baf7841055756e/5432947380.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/84799973055.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/40652390135.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/20909572647.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088327ebf1dd---1917985742.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jititirowajifurijibumul.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sezogekerugit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=latches+and+flip+flop+pdfPDF 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_off0000afcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCB 14336 bytes
SHA-256: bb1d5ba1ea97f9672949956e207b1ef70f835ffadd14f9572c7ca833002d1342
font_01_sfnt_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 10576 bytes
SHA-256: 93f748cf43b0bad9a06e45effc5228ff08ecd9a3ad2eb124a00faa9c42d8d97d

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