Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a1b924dc29ec21…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 03:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5a5b5dff9f799bda9c6e52854b2933e SHA-1: fa5c7059b7582725d74c4bf47b6a5a035f449583 SHA-256: a1a1b924dc29ec214dfb7b5e8a566dbd8fe27a80b5a54471dce4c222f3664839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=persona+3+broken+social+link PDF link annotation
    • https://implantsdentairesdesmoulins.com/upload/editor/file/45881654044.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/69548357461.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907125512.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/8871892538.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/92287877063.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/wobeze.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ed26557a5---xadobasafunirolulamak.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/kopafaninokumopal.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/doxojuwodikul.pdfIn PDF document text
    • http://bdsductri.com/upload/files/pojoxavajo.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/ruguvo.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/35202517306.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/42883115685.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/bojopubelor.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eceobkcvteocpch46afjp8eg44/tiwelinari.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/gawitaduz.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/vinipejedodipudexudalojo.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/kazawonumopevigipibivira.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142394d164c4---lisamikenomuduxudonamaw.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/65934918540.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/medijoxat.pdfIn PDF document text
    • http://oris-am.com/editor_up/manutisif.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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 10528 bytes
SHA-256: bc742e03ca2e92225a8d798389d563a299cc0271c0331e49fa7c0e5885f8fc03
font_01_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 18540 bytes
SHA-256: 1cd8e8db9c1822219c57ddf6d296ac762142671dd59b28a6ae3ad9cde15ca368