Malicious PDF — malware analysis report

Static analysis result for SHA-256 044fe413077924f1…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 01:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85c578d00a475152bc0f0b54bb3a2119 SHA-1: 2e8011dd02883d57ca1dea38cf81c807f7655495 SHA-256: 044fe413077924f1e3d8ca971ae4c098666e690038eb6c8dcdd57820ea50d2fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9379fbfe2427e6b4ff026a6cc0dbd83e/tivugawo.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebfaa0f85---gemidedujuka.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7ecb0dfeb64c477ca2c3d31af4272abd/juwujepezeripodenukuxopus.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727e8730930---piles.pdf
    • https://lymfologi.se/anvandarbilder/221/files/90402987746.pdf
    • http://zeroseistudio.eu/userfiles/files/ketefititelumajin.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/85882498760.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607024ce38b08---mupewonalonaz.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b65209da88898130f9d6cff12840add0/2573730054.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/boveridesikowe.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/56029069472.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cfc687f9c---10492122767.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0btmpbqh0hpf1a6sh7td7fu9qi/73474818834.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f8fa5c1b2---gojorubebifazem.pdf
    • http://murito.fr/ckfinder/userfiles/files/fedenarozovukegufikodovub.pdf
    • http://gursakaryahukuk.com/images/file/nawasogepojivotolotub.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/40olsvk2rv7c1bkmfr53g4hm41/kigazutupoziwaro.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/40757e0c1f023f45078e98adef956416/mitakasoz.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c9ff787e518558cc94d48104d40ac3d6/61543140407.pdf
    • http://centrostudiapulia.it/files/files/sokevulafisaxiju.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869b082517a---6300374611.pdf
    • http://willbramephotography.com/11805352063.pdf
    • http://bixenony.com/userfiles/files/20822470913.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/948989a1sl4ms2pbe73ab3qu9o/48840362023.pdf
    • http://www.allatpatikapecs.hu/images/file/43186297320.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f8b7d1a2---71671558720.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=novena+to+st+lucy+patron+saint+of+eyes
    • 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_off0000f8af.bin
51298c322c55dcb9da883a7f88ab41ba80928bb46b09d2ea749182ac708d6425
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 10732 bytes
font_01_sfnt_off0001118a.bin
233ee820c45edee0eac9e0cfe227251f6436667530d31fdb64f5a1c697d17f16
pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 17540 bytes
font_02_sfnt_off00013e63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 16792 bytes