Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8af8c5cec72c29a…

MALICIOUS

PDF

84.2 KB Created: 2021-07-07 05:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80341dd97ed4018423f8b9bb1643b224 SHA-1: bbf9980c9805d04d48978a69674af594f6c2bdc9 SHA-256: d8af8c5cec72c29af69d3c51ed1c916d98a96f33355792f152a71b96aafce064
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of urgency lures further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=franklin+county+misdemeanor+probation
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fa905cf7e---pukivur.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/920ef9dc539c1a169e8060fd425b1e3b/womizaxerujekeko.pdf
    • http://beming.com/ressource/site-image/files/71599473455.pdf
    • http://aisef.org/uploads/userfiles/file/file/zerilawusa.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d674e2a0---rovibojatezonezumunuzo.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16088e236cfc39---83581169677.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/44225366875.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4890608f2---wavigeb.pdf
    • https://saam.vn/images/content/file/15666570222.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a01fe9719---91027391791.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/67536121ba1638799fb7cdf53df87375/sazix.pdf
    • http://engroupe.ca/aym_image/files/nasowajenituzo.pdf
    • http://csc0351.com/userfiles/file/20210613005023_ix30sg.pdf
    • http://canxetaianhduc.com/images/file/tenab.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/uk9965mhfadpuv7kqbscmeuhe1/30774553402.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k82il27lnhbjp2iha72v14n3i0/sigadunasenudutenab.pdf
    • http://www.allatpatikapecs.hu/images/file/sebijela.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c84de811af9---57230612006.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b3dfeade1---najefibokowivefutalejumiv.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_off0000e5ee.bin
341f2894a6836f371116bde326cd87b9567b98813d4c9f22de4d623694e01c70
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 16844 bytes
font_01_sfnt_off00011208.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
font_02_sfnt_off00012a1f.bin
4111780d30101f04003bceb8bbc8590505ce1b5dfa52e7ef8a425a77556a4fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 11100 bytes