Malicious PDF — malware analysis report

Static analysis result for SHA-256 0201fb2219c8e828…

MALICIOUS

PDF

89.8 KB Created: 2021-09-16 21:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b5535ae6887b4a29041c23e2d190c71 SHA-1: b518272ff429c794578bab114694359e814a5ff8 SHA-256: 0201fb2219c8e828568546831829ca44b841a324c996ee8c24297dc968b7ffd8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://laborke.ru/uplcv?utm_term=best+video+editing+app+for+smartphone
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b28d5aabf4---nawibukokidibiwinefu.pdf
    • https://bywuf.org/upload/editor/files/lumejiz.pdf
    • http://sokole-tps.pl/userfiles/file/pibolisazizuginivivawo.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3ef3fea9e07cb4c1b65e72d1005b0722/vipamabasupalojagosebe.pdf
    • http://sportservistocik.cz/UserFiles/File/gilujizasitajunom.pdf
    • http://pop-around.com/file_media/file_image/file/29892805542.pdf
    • http://machin.kr/userData/board/file/981394107.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8f7765cefee1d7b34c70b208ee99ff42/mifosukigojexuzifeg.pdf
    • http://galerie45.com/userfiles/file/27302746614.pdf
    • http://hytechcommunications.com/userfiles/file/loguweme.pdf
    • http://elfast.ru/userfiles/file/73345118812.pdf
    • http://oris-am.com/editor_up/30848298943.pdf
    • https://liftsystems.ro/LiftFiles/file/mozesifibupobiku.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bf27fd81---71663690863.pdf
    • http://mastrodibaglio.it/userfiles/files/27104552131.pdf
    • http://thucphamchucnangmy.vn/uploads/files/67086105010.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/79996988114.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/gotab.pdf
    • https://autohausnschmidt.de/userfiles/file/woxaxotiwujewepefakafinip.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hs4puku0p7i1q53o8ndgbpupgm/17006404268.pdf
    • https://maryamghiasi.com/images/upload/files/runalovelewupomomafuxidon.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613682c4de493---zezogokisolapi.pdf
    • http://mayinmaunhat.com/upload/files/raxijuzel.pdf
    • http://superfasttv.com/uploads/files/vitige.pdf
    • http://romovi.net/sgi_userfiles/userfiles/files/51358172187.pdf
    • https://navliecky.net/userfiles/file/46560000711.pdf
    • 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_off0000fa55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16792 bytes
font_01_sfnt_off0001126c.bin
f470f97b975cbc4abbac9e765d5710d0f41dc6e48d01ec7797849caaded6fa69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 11020 bytes
font_02_sfnt_off00012baf.bin
4411af78ceb87e8934bbc5d86df989fc6f1c2ba575a8e5eea15857d39d5d2b48
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAF 17760 bytes