Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b956c961e447ae8…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 18:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c6402cbf45a01dd7eec411d834aabcc SHA-1: 3ffd508a790c314136dfc904110aaf8695935670 SHA-256: 7b956c961e447ae859c929b6454ed10ced3cc674c68ef9add79dcc177a10a683
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam pretext, aiming to trick users into interacting with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a943d2c4---67885216453.pdf
    • https://kurek-rowery.pl/user_pict/file/sigoxedanubupi.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161304e3da4f57---xukuraxumi.pdf
    • http://smolninskayahotel.com/userfiles/file/jaxibom.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a40c05ee77---dukiparabavupinilonovut.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/jurofa.pdf
    • http://qianxi.cn/filespath/files/20210907055116.pdf
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/11664314785.pdf
    • https://ambalatender.com/upload/files/46829364223.pdf
    • http://bienchidan.org/uploads/files/ranuvatukugidexagoz.pdf
    • https://kohphanganhotelandtour.com/userfiles/file/20571668870.pdf
    • https://adoz.cz/ckfinder/userfiles/files/dukotovorarejonewarar.pdf
    • https://charterfori.ir/basefile/charterforiir/files/jiputuzubibolixanamedijo.pdf
    • http://www.awakohchang.com/image/upload/File/8536895593.pdf
    • http://historia-bfured.hu/userfiles/file/32845607336.pdf
    • http://becskeicsodajo.hu/admin/fck_upload/file/84464217470.pdf
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/27443406088.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/49a85958eb402c8b7bd22d666d6b9d30/pejilaruxipejevemefipog.pdf
    • http://suaups.net/userfiles/file/luwupodaboniwet.pdf
    • http://laskod.hu/userfiles/file/87832734645.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/ramapugi.pdf
    • https://hurghadalife.net/userfiles/files/94081130002.pdf
    • https://dadrarad.ro/userfiles/file/fuzufu.pdf
    • https://chanty.dacola.com/upload/files/zetaza.pdf
    • https://tahubunting1.com/contents/files/mutanagat.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ls+inverter+is7+manual
    • 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_off0000b0ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EF 16792 bytes
font_01_sfnt_off0000c901.bin
22645c44d4936fad1530298fdc4316b31f9525bd73d33031830e411b72c768c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 15264 bytes
font_02_sfnt_off0000efd6.bin
b32b25fe5486d3502c714158bbb919c93fac71d6d94c7f739a387842499bb739
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 10320 bytes