Malicious PDF — malware analysis report

Static analysis result for SHA-256 509afc655ce9452e…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 06:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c28fa02cbd76b8817c163415592e47d8 SHA-1: 42492902a722ead654de9cd6902b40229163b23f SHA-256: 509afc655ce9452e9cac673d44879c69afaa2d610305fc0d0ab3db067cb678a7
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bagliodeimille.it/userfiles/files/rirawelesipikogamazid.pdf
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/puripunovatufufulegij.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/29860886034.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9735be2e---15838875416.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a370f4ad62f788bdd3861de2bd339414/fulidusikulonuduw.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3fc0ac04---sawisogafimiwivajujasuv.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bjl1uf18cf59kjkm5mmobn0oj0/22567133352.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mbo73srcur1a4vda2isq6qlitb/pesokubojos.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6e645d49cc9e25b0be75d2cf645aea0e/55886575588.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160820fcad54b9---xazaza.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/ziwip.pdf
    • http://meadescafe.com/userfiles/file/60349008426.pdf
    • http://krevue.cz/UserFiles/File/wamuvipeliraloludibizes.pdf
    • http://fabtur.ru/upload/files/6279198421.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/m17m750sl4fge719cjff7saupt/32309003823.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b849ae617d7---lewokib.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-5-24/20210524184903544541.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c908d1c53e---mewifutatedifekos.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/553c8346570ef98d7c38049efba5402f/zimibojabidibosu.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/b8tr8n7ifp7qcsgf84a1hs50bu/69667772030.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g0quqggighiv2elr3b7o8mibnu/46682115054.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/cf09ac4efef0e33fde7faf78826559ca/8235760293.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607794b0a104d---18649192665.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fda587554---63080743302.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/faohpioqunmaba36rqu05cl453/48490319576.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9058bcf6---jewepur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=application+of+power+series+in+mechanical+engineering
    • 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_off0000feb1.bin
edf6975082459f8ff442d58d13d472177d87c7f535bdcaf774843ef67ad38cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 10992 bytes
font_01_sfnt_off0001182d.bin
9bafed11492abba762ce5203324b0b0650cb968bfbf9dcfb30d6a14129fab68c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 16360 bytes
font_02_sfnt_off00014273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 16792 bytes