Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfe2e88d1e695cc…

MALICIOUS

PDF

92.3 KB Created: 2021-08-12 08:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9947c3e67e613ef1745cb335db9fec98 SHA-1: cab859bbd87d5dcb7cbca2eb0cbd50ba1d6953ea SHA-256: 3dfe2e88d1e695cc119b24c948b3f349c1b0b0a4fae3dc6b3b63c58794a75da6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised websites or disposable domains. This pattern is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://project-lovcen.me/userfiles/file/sezuresovukegovupovupuzin.pdf In PDF document text
    • http://ahkjt.com/upfile/file/gogusiwetozimom.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c552fc24f6e890d24c404ad6697b6957/kefusujolawogonel.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1d89a8ee43a9fec4575978994c93eae0/rumebutigusifad.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/mizuzedusalafogojojobed.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a6c320ac577844e03930a38c7900e018/fagebetewumijawobedu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/71691437258.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/61300380779.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/batebizadetejog.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/57694306881.pdfIn PDF document text
    • https://signika.pl/Upload/file/27771346959.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/lijikazedalebofinusajole.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/sixureli.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e295931cd0909144c9cccdd83fb7b172/75832605713.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/gezisupumofefenofifosij.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1762138cbb---rasogogavaxaluwid.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/85087795249.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/92du1vb9vasebenecd9211od52/19039805246.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1fc18e25---kobasow.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084318d932d1---33639430471.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ccb2d6421---mokowejujapusabem.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddb9d37862---fuduzerubukexewovud.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/reboluzaviribuzabubofi.pdfIn PDF document text
    • http://tahitotfaluovodak.hu/ckfinder/userfiles/files/59686760700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+science+books+for+13+year+oldsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/531fffb6e6e771882a1ce8bd060e6b50/62641232167.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16868 bytes
SHA-256: 91486d47ae75044126dccda58e1efa934b2fcb9a4d8433610bd18675c40ede33
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001495d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1495D 11092 bytes
SHA-256: 217961f81720a03a3e43278c6dbf8654f70c59ff42ef364891d445b2b53f52de