Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa77c65e194385d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 02:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b944e39d8edda7e65528034f0cb169ac SHA-1: 7b9cfa4276c9758ef3dfe838cd3795b03d94d7b6 SHA-256: 0fa77c65e194385d680b5d585ffa99da8021e3caf8b0a4ec7b444b922705d324
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, designed to lure users into clicking potentially harmful links. The presence of multiple distinct hosts and link farm characteristics suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://activepymes.com/pub/file/91523947501.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f10ab415a---pazisepab.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711eb4ac275---25977458853.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/avvuqqfjkle2l2mr6q3u2q2rom/mukotamujon.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4814a98eef44ce05c69dd2e9c6fae850/gifoxurofagido.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/34255163572.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3f0c985fa3162aab705cc5e24b1239c0/1406947031.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/77800816422.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d431e7e6c09---maniwetu.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/39586186161.pdfIn PDF document text
    • http://adveotec.com/img/file/naguxewaresibojagoxizarij.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f2d0ad9604ffd849a297c6cd18ac761d/bofulisedimegiwaremu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad40c488b---lojotupafuwomadik.pdfIn PDF document text
    • http://hopkim.vn/upload/files/95175438450.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5b2a78b8072625b610fd7ea4f27e77de/73172319129.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/52466428578.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8605eaecafda54e1b6fc81d76e801fc5/45134345822.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/51746896027.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/dedejokomajaxefalumiliro.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072322b30099---buboxapizuk.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/10716722917.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fakaginilederax.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/f1qurop72f1fbq4h0gg5a3re6t/buxenuxinud.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kidemalimibivumipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=controlling+for+a+variablePDF 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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 16880 bytes
SHA-256: bc74f41285f6377e43ad8dd17e244663baaab7ccc885324604784b2179d4d5b0
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 10456 bytes
SHA-256: 21290970b6a0478fd742adf3f6d5c08323b49f47141961383d0fd32cf76f9c60

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