Malicious PDF — malware analysis report

Static analysis result for SHA-256 944874f90615de87…

MALICIOUS

PDF

82.9 KB Created: 2021-07-07 08:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c6eaebbc2b47427d8ce15624be92a03 SHA-1: 145ef1d165818c642ed8dfef717d737a349e142f SHA-256: 944874f90615de875cebbbaa4bc6f3026b8a51fd3dca83e543050bcfdda307b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.hgbehringer.de/img/files/files/soxisurim.pdf
    • http://atenngo.com/admin/sites/site/documents/20602032730.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gjhnkpj4a5camccbkd56ss7542/65770057823.pdf
    • https://vibanghanoi.com/uploads/files/89108712822.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0335e80f392da1304cb29dff65dd401d/tuwewipidupezedurokizolak.pdf
    • https://juhaszautovill.hu/userfiles/file/temisaxebut.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/rekobiwika.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095426bc065f---lidesiwizaxotabewewejime.pdf
    • http://bostonmentors.com/userfiles/file/97120215751.pdf
    • https://hankilfood.com/upfile/files/36709644394.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/06b491763281b4480788c7c341b9e457/diporelenupumi.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607866cbc579f---25065380345.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076c3238cddf---33061836693.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/xetoselisofozu.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/275e98b2de5e907f6c3248d1c6e74131/tekuje.pdf
    • https://isosklo.cz/uploads/56029266110.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/24424035779.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb3f4a425---minejadejebakuxidupifovef.pdf
    • https://bocion.com/ckfinder/userfiles/files/kevawinawanotipopufukoso.pdf
    • http://shmgec.com/Uploadfiles/files/84361303936.pdf
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/11531330823.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c48e263ee---sejuropaxedasoviw.pdf
    • http://capital96.com/userfiles/file/25499584336.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+symbol+for+directly+proportional
    • 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_off0000d8a4.bin
bd6944abb7704717f6317dc84283ffc7f0646fe71fd7dd8995a0b4da6d956052
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 11132 bytes
font_01_sfnt_off0000f240.bin
52bcf74d99684097dae52631accb3ef77bd06a7291b317e652d3eb2fee60dc15
pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 18940 bytes
font_02_sfnt_off00012473.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes