Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b74689ccae3d068…

MALICIOUS

PDF

83.2 KB Created: 2021-08-30 08:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc1f75e6c932268435dc873cb00182ad SHA-1: 62d8a6dd7d8b7d36a3500b1ab0be00d79594b19c SHA-256: 3b74689ccae3d0681ef9766430f3dfef63f3d916ba12ee9a57bcf371bd217487
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a high number of links, many of which point to compromised WordPress uploads and disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cascad-trans.ru/files/63349964200.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d9a659406347703f215a445831bdd837/33437192168.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b9fcf884033440eead596c553c69c64e/nefuliwesa.pdf
    • https://globalmediaminds.com/uploads/files/vinebepupudodojolo.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/47830474686.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e72b32fa7---31493828877.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877bbe33625---fufuzolegodaratinefaw.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/rawikalakovivigam.pdf
    • http://yokohama-model.com/userfiles/files/91436654002.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ifg07ifn7ajsrv8p0bbjgrjad4/zubasewik.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210818164354.pdf
    • http://bjaimama.com/data/upload/2021/07/file/202107232102417919.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f36d868300ee4f1e109ff448862c3827/kojax.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0babc9c50d---zodip.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d221cb50424---84053053642.pdf
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/nekiviraxawaga.pdf
    • https://gkia.org/kingkong/userfiles/files/10709762230.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910cb9d6c---86729452702.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16262280111703.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103172c8dcc5---kopukarum.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/541f662d153102e4dd853b899fcd9e69/34885673836.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/sebov.pdf
    • http://analogsys.com/uploaded/file/370073122609253fd85b69.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/3587cac91dfdb87255ce162ec86e2890/xufax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=online+pdf+watermark+remover
    • 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_off0000e041.bin
6c320edf435fea1ffe9ce5a3d204bb037121ca91f136c553a7e1527d59ba8e62
pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 17620 bytes
font_01_sfnt_off00010dce.bin
a6e632d105dc5bec568f3365bc4cae3816d69f95659ae8e7b89d708a097dd7d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 10760 bytes
font_02_sfnt_off0001269a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 16792 bytes