Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad611d9b1a0fa4b…

MALICIOUS

PDF

74.3 KB Created: 2021-06-30 00:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd0977072c236b728382d77aa096563b SHA-1: d71103ae63e02b704759b2e81cddc98f68e76b36 SHA-256: 3ad611d9b1a0fa4bdb8d63992ddff0fcf39cc7e02f7a7364916d9e74bedc06c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is used to distribute further malicious content or phish for credentials. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://alexanderjamesbackcatalogue.com/userfiles/file/41129691181.pdf
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/13074910532.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/58718761260.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rceeqasghki2sshq7heacn53v2/vemegonunot.pdf
    • https://al-farh-iq.com/upload/userfiles/file/jibotibawusukisopi.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/af87ccbe0cd6a50e4eccd16f10687df3/mutebumunop.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ij0n6g39bninu0ofg3pv89picf/44262083640.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7eca9a126---90141331666.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/874507bb093f7570795492f2663d0287/femuluforuzibetenefe.pdf
    • http://davidhammerstein.org/userfiles/file/nutan.pdf
    • http://akkoryazilim.com/userfiles/file/zubuz.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081458a317af---59847457602.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/s12pot90b887a6kq6dgelk4ipi/22994106731.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/xewusaforipi.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ce6t7pdoo6ldpoqca9eti6otn4/79837680994.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7081e6e62a---vanelovedekizaga.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b89463445fa---68267752927.pdf
    • http://daoltrading.com/userData/board/file/kajujinegowebagazeboro.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/6d8cd49634e0700d1ba578af357ad25b/vurekoxexirega.pdf
    • https://actorconseil.com/files/file/1252214701.pdf
    • http://ahchala.com/img/file/nekatomubovi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=water+taxi+west+seattle
    • 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_off0000c2b2.bin
ab21282f3273b8443f6215a177098df3de8cd1bb45cfc9fe1679b10f769a812a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 16500 bytes
font_01_sfnt_off0000ed9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 16792 bytes
font_02_sfnt_off000105b2.bin
0af27897e194dcab8dda2002d47162c0b34154b0d6363f67462b5497b852fc19
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 10060 bytes