Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb5b0826a5b34c5…

MALICIOUS

PDF

67.5 KB Created: 2021-09-24 11:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c60b142bce24d83008a169f495a9eb64 SHA-1: 34ec9e7ed13170ecf1fb17d1edaea4fdb1f996ba SHA-256: ddb5b0826a5b34c563b72d85e9f3cbe859eb3f666855027533187721fcd44352
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only content and embedded action triggers. It contains numerous links pointing to external domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://crewmak.ru/uplcv?utm_term=the+housemaid+korean+movie+english+subtitles PDF link annotation
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/77882559384.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/xosojorimavarekekasabi.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/83150432161.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/97594416192.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/venekug.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/dubefisaduso.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9gdrns65aileustoh8v7tfs2bs/ravemilulizarejob.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b332798305---40815463543.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210917011021.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/4344723205.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/72922032474.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/26557177201.pdfIn PDF document text
    • http://eventechsite.com/files/files/52961128610.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/32786485604.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/wumozigoviga.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/womadubizazudu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/69870204348.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1f82999082bea63dc495bd6658500b0a/felodoxegobazoziluko.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bb556a977b7b64e4303a0f09d7b78fbc/jilufuvotojibe.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/92429002001.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/26401630218.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/89153901163.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_off0000ad4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4C 13860 bytes
SHA-256: 4500e13f170b6c312eeea2541a82586be5af5dc692f68b5e20d4d202b3f0920f
font_01_sfnt_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 11056 bytes
SHA-256: b9af14132cf88a976436fffcff27e3471e1906d80b362aca122544fc213bb9dc

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