Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac062f5ef1fac45f…

MALICIOUS

PDF

91.0 KB Created: 2021-06-25 23:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81ae5c3f3fc934970cb569d9fc1cda4a SHA-1: 685394e4050aafe0980a1e193ad3c50000b4de09 SHA-256: ac062f5ef1fac45fd67a3a160bf9624bb5391185041617f18023ed4b5c4f2cf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised websites hosted on disposable domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=list+of+people+who+wrote+the+bible
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f4288f58ea6f60e5451edc2b605046c2/72565060903.pdf
    • http://siembra.me/uploads/files/lorurefuna.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984a1678926---36107360131.pdf
    • http://k1a.ru/images/files/file/6027981681.pdf
    • http://chi-kara.net/userfiles/file/kativ.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mvipncrvbg08esv36pebc2irs3/vosunuvasomus.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3d46e0feaa3dd604b0315d248a0e63cd/94886165575.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ekpa969diut3jfbjdbii2dqhs3/pigowarotolosarofiw.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1dvv76lv3efn2ejbk7onn7kf9l/tedixanomipumugegal.pdf
    • http://rjt1.org/upload/files/5092392482.pdf
    • https://emprenderem.cl/files/1640877681.pdf
    • https://mahae.hu/files/files/32089516729.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/e8gula0k42sd8bqrmsujkoq6f4/26393180182.pdf
    • http://ilturismoinitalia.it/userfiles/files/vudodudimofomusadutexidi.pdf
    • https://path.mn/userfiles/files/jidabojeb.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6f5a8954f8eda640a06c64081e816e27/96355442114.pdf
    • http://arkystudio.eu/userfiles/files/98600376545.pdf
    • http://alexlunacoach.com/img/editor/file/68283927566.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1mgsl611lkjsng0hh68bm24nfh/41260924308.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7665346fa---22640125415.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/facd055bf78eea394ad80e25d0529ad6/7795921835.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/eegussathf6bfjvpr8shhj348i/kokikikuromidisetodimuvej.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_off00010416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 16792 bytes
font_01_sfnt_off00011c28.bin
de534290b07627705cd16c4e909974d001a0a51604a1f5424ce6d09bd6b1cd34
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 16644 bytes
font_02_sfnt_off00014755.bin
e3d70149fb876db8192db69043bdd4ce7c6b187f93e1de97acd42b59dbe0f49e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14755 10372 bytes