Malicious PDF — malware analysis report

Static analysis result for SHA-256 da301ebd1913d631…

MALICIOUS

PDF

91.1 KB Created: 2021-08-07 12:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4fa1350f378c94c4ff926dbf7e32dee3 SHA-1: 16557115a34b8a44c232c2731fe0a5c8a52cae88 SHA-256: da301ebd1913d6318f82ad383301ad4d7220abeb681aa000490e14651cacdcbf
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links for potentially deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://changrung.com/ckfinder/userfiles/files/guwerokelakedofav.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a152f2891e---jizuxibinabutupalajenixa.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tomobirutofuku.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cbam0sjtanmaqecu4vkpob05q4/neredirofebidawunalod.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/lafagilizarikediluxe.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/e18b531bcc75abd857d368a3a863fa3e/29156811457.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1472742693609cb7331d40d.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgm8qa0r2gchf4i4q3ugl3th4v/89107794431.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/64626218405.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bd6f67bb6292da18620a09aa8023b3aa/kadubikig.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/53804402431.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/90394648720.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907a8a65eb4---76748748151.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/88672360722.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/sudutoje.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7723a5d74afa292ba0283b788246a457/81615288428.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8f901899d5f1b757abca2748d610970/kekikagavapumazewelab.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273ef6e606---29711009179.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5d10dbe5---wamakutetobosowot.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210724_012815.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/lejemuroso.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/dovifo.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/fetutunixapakojakorina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+no+flour+no+sugar+dietPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/42aabcfa854d80bdd6afbd0c0f082fb2/36928139594.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_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 10724 bytes
SHA-256: 2677bd252b26e6df9e63f35406f884b757cf8354856f7d7e2612f8a1d1cc806c
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 17556 bytes
SHA-256: 319527c8b7f93b005d1c705ab3119497220f987784ff787dadc7b56379eef720