Malicious PDF — malware analysis report

Static analysis result for SHA-256 5691084b62d5ec70…

MALICIOUS

PDF

92.0 KB Created: 2021-09-07 01:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 103eebcf018d6837aa964e82eae58706 SHA-1: 9a3e8739d4c9c0cf65a2d351cd0f66ce6fb4f4b2 SHA-256: 5691084b62d5ec7055ba8f6b5c276efcf175139cc77853372e9bf36d16c00938
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many hosted on compromised or disposable domains. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c042fe763be---turikonomodi.pdf In PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/nigimolokusikuvedili.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/26130556081.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/94070382661.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/berabiwuluwenidez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc8126b88---22142293172.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/43132910053.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/999f5ea869a4d14c388fea0674888e61/pukupulubolopuvedekosu.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/58590413699.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16106a5f79b3a7---kedixumefuxit.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2bf5979c49f44bd563fcd3bef6c363bd/kemuzenirozumu.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/relifubafoxo.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/nuzizulijezalijiv.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/pexot.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210825_000714.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/tomujibe.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a3e13218f35f09bde196da856cc45632/jopesasizaxapijiguwoma.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607306b4c9202---vesugekukapevunelixa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161185aee3923a---furepoximidemi.pdfIn PDF document text
    • https://medtek.vn/storage/file/kuxufovujo.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/83378658621.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pe16ib37obubjh2m029eheehsl/pineges.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/gumutabebujomifedopewo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf939c0ad55---torutusigegakuput.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/14636284093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lion+alcolmeter+sd+400+touch+manualPDF link annotation
    • 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_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 10892 bytes
SHA-256: cf7a53f334a01703bea5613f97f54e8127cb7aab95c86cf48d18d4daa41cb73c
font_01_sfnt_off0001160e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 19860 bytes
SHA-256: 372ba1517ef6c7a1434a3f9e0c48c9f91001b5519f3046b808ae157f216f4100

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