Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad83163c9576f178…

MALICIOUS

PDF

77.6 KB Created: 2021-07-02 00:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ebc21fb7b05b0de9ed28acaee92e525c SHA-1: ee0d8fd8dfc7de5e27c497a93b676f4cc041f43d SHA-256: ad83163c9576f178daf471821fbbf7b7a625c9464b6a4b284ee8481ccab9560c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The document body is unreadable, but the numerous URLs and heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://firegallery.ru/img/upload/1534722742.pdf In PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cd32fa72405---69067916510.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdb68bb144---86408074129.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c891151c5---10650843989.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/82ab133be62d7e64a73dc3bc8ae7118f/34499882925.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/639c5f192f8f37c95d6ad34ab7619838/97118192752.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/73007622243.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlj1pgb27blupsf554n1akjt3l/gasoguni.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e56d4a5e---zosugoxofabariliba.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/e4edg3potvijgep8gvci40lv40/4227039607.pdfIn PDF document text
    • https://magatek.com/documents/file/wofujox.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff754f712---tisunarosinojukitipizot.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e08e3d615---sigiwukavesokotap.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071651a01e57---14648624288.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe0466231---retozowobumal.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/turitukuf.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/45934744760.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/10c541027e89c03055023cf96105fa34/49372054735.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/47097367714.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/78268557091.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0e22eca0---gitozuk.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b66c7b04---ladeduzibevesojuwulosog.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a612f31a6c552ec26f22bfcd9ef68d7/53530048133.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/49fc342b840e645f15a12d8ec41de2e3/75065611622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=job+analysis+questionnairePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 17208 bytes
SHA-256: 1c6cc9440368515281b76eca402bddbb01b6393ade0f98f15139934465e280f6
font_02_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 10592 bytes
SHA-256: b5b9fa5e798272594e6aa1f7f995a37c416e355d339eeedbb50e47499c25b5e6

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