Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be0876627370128…

MALICIOUS

PDF

118.9 KB Created: 2021-06-28 10:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83a363610d0bbdb78bf18dec3e22e886 SHA-1: 81960bcf4e67bc829220f08e8f9f9c4dd9f09f75 SHA-256: 6be08766273701281e35c89e66f76c6706fe69339a50a235494c7ad94e3f0627
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or disposable hosting. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable macros or editing, a common tactic to bypass security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://akcjonariusz.com/UserFiles/file/74322945518.pdf
    • https://tenfci.org/userfiles/file/rojagakixumibakowiwo.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/65cd7db79e02bc838088da3d6313aeb1/lebewivototit.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc4e60448---5910035178.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/78d14b505bf6e1a0278674c845f65b53/visofovolekowur.pdf
    • http://aa-nusd.jp/wafezolawelireve.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607174d893e0a---47325802220.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bh8u29tc75f4pdn39ie5361k9v/71111795623.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba9b28b14---69218497548.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d7cb99a44d2fbbfbd34afb4b638df659/kimadevizedafisivuzulefev.pdf
    • http://orchid-daikanyama.com/userfiles/file/11225044454.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/530cbccfc4a69cf0f8aaba6189e4b9a9/99398886554.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/kr1oaornb96j01pjpp4pegj1q2/nitarinumevabisejilegorag.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bc0e0647c---rowuxekasazajizamusumog.pdf
    • https://laser123.com/geektic/files/polokikirovesajes.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7mqohmrnh21paftn5gklo695dq/suzulumirukofaju.pdf
    • http://liburnia.pl/userfiles/file/romerivurak.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980093333---potaponan.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/s12a1us8abbgl45546icq9vm3v/sunozogunefogud.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22d76ca1f---83336978177.pdf
    • https://myphambambi.com/webroot/img/files/78898652589.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ee605426---danemotulakirufatarob.pdf
    • https://iwnta.com/userfiles/file/44949467683.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077e806cf911---94570704331.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/edda6d40a433d7d1d6815087bc688358/68423489701.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=symptoms+of+diphtheria+in+humans
    • 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_off00016b97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16B97 16792 bytes
font_01_sfnt_off000183ae.bin
374dfc787dd45d740423753ad37f228b175e2e4ecdb40240db0b37b3683d45e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x183AE 11008 bytes
font_02_sfnt_off00019d11.bin
8771b2d56bf89e65294bbf5af7da2dbf70dbc377e9c089fbad50182aae1b09dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x19D11 18788 bytes