Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf6429b9b542a96…

MALICIOUS

PDF

84.9 KB Created: 2021-06-30 00:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c28f7a3f844f48759909818689db34f9 SHA-1: c7e4d8ddb3a7eae0da93bff9b3914ee7dbf90a66 SHA-256: dcf6429b9b542a962785f44827cb084323bfe27357015f674fc135db385e6d87
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, which act as a link farm. These links likely serve to obscure the true destination and distribute malicious content. ClamAV and ML classifiers strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d2b8e364---74062949138.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fadd9b9c65205241d9df0cdc25d84695/78408581136.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/3be1b5597e2b3f89408873907fc11741/1759477658.pdf
    • http://wtmongolia.com/materials/file/98409060369.pdf
    • http://pphu-joanna.pl/fckpliki/file/ripuv.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a54c3644---63420651032.pdf
    • http://wahluenfty.com/userfiles/debopuduvezuketidosuw.pdf
    • http://ulv-fogger.ru/d/files/50397159849.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rh5cqj3ctsjvkjo7rue2qtlqt3/jiwerowuwamo.pdf
    • http://robertoantoniz.com/resources/original/file/60598975399.pdf
    • http://foto-klub.dk/userfiles/file/doretasemurow.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609813cb3a7fe---kolebidikupaxepaxuxupize.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e460ae4b13---89713335886.pdf
    • http://goldnumber.info/userfiles/file/96375390807.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/aca8d3835ea42a3858ac79e87e2db1e0/24745550931.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa4c47e90---xibadutunawukovo.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1c8f662af374275a2f99d523d1046da6/67050595648.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/220c934bd190452ee1b995764be7b1f7/38624292955.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/51l4jipcp0jeaphlc9lreuvoe0/2957950979.pdf
    • https://vildmarksjagt.dk/userfiles/file/85621867560.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bq2hm33gk34si4e5vf96of76kh/kesor.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/18183861771.pdf
    • https://www.avantagesapp.com/uploads/files/zikelefirepusulowumixotu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tubidy+mobile+free+music+download+mp3
    • 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_off0000e5ef.bin
bfb36c37a9dd3433b69cee76d544f1a617c5cfa87da0a5d59799a239f4f0e960
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 17620 bytes
font_01_sfnt_off00011434.bin
b6a55df74dbaa0f63f916f6c4d67f3db18296f257e61d9a1be65ffed06bbf70b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 11256 bytes
font_02_sfnt_off00012e6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 16792 bytes