Malicious PDF — malware analysis report

Static analysis result for SHA-256 83944b3f68672c14…

MALICIOUS

PDF

72.0 KB Created: 2021-06-28 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b72bc8daefc922ac28787df33350fc25 SHA-1: 84fe603401b53c4944e1d9de431aa0378a1275c4 SHA-256: 83944b3f68672c14eb41a5dc62f69183eb2e189acce86ecb2b2ff6d7bed49899
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=incroyable+meaning+english
    • http://svsteinfurth.de/radsportfiles/file/sinomas.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/salevumijifaxidaloki.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6a519610---wadutolar.pdf
    • http://clasesholandes.com/userfiles/file/33139071111.pdf
    • https://swift-tw.com/lcc/upload/files/bubasodigunemidezuxole.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/12858056679.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092415fd2fb7---dowolutawiresa.pdf
    • http://fly.no1-yes.com/userfiles/file/votamixovixa.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4ca5582b---17632283041.pdf
    • http://andreaslasnik.com/data/files/33781308873.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd4907e44---jimezi.pdf
    • http://www.tomasjelinek.com/img/pub/file/64489622086.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff8457774d---23961463360.pdf
    • http://meble-tk.pl/userfiles/file/86595237489.pdf
    • https://hotnews.md/upload/userfiles/files/93321502466.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e30994a8e---mukikavawuberimeresum.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9c17feb4d243de5520ea7e3db642ffe2/zoxujizusogudatogubaxaj.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f9ac7220---rutumugizazepa.pdf
    • http://didocrosby.com/imagenes/file/65936162121.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/031958722628df1c87c78e6410f04352/lomepizurur.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/12518313672.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eedea43c66---21525251811.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/32478973727.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ivp7vfvade7gbffa5pfgees8bj/bikun.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9e18e9d295497a4d2ca6f1594047ad3d/valovo.pdf
    • 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_off0000b3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 16792 bytes
font_01_sfnt_off0000cbc2.bin
16d93c97cc07f7b6d4ddad03b84050dca615dc4ea02d9e76f1df61d90e4c2dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 18704 bytes
font_02_sfnt_off0000fa18.bin
8e0f571349a78f5ca88788c1cf1fe90ff5b70291b31db08d51abefad4f8b6c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10784 bytes