Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e881ab62efc0ad…

MALICIOUS

PDF

87.0 KB Created: 2021-06-10 08:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f5ea9fccad5d84de1f80589f6c3f660 SHA-1: f61ffd07f530ca238969c1e138bf995111c2d598 SHA-256: f7e881ab62efc0ada4864180a88eb848132524121c1ee594a2d6a48862a75f73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The primary URL suggests a lure for downloading 'Gta san andreas', indicating a phishing or scam attempt. ClamAV detection and ML classification strongly indicate malicious intent, likely to deliver a second-stage payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=gta+san+andreas+download+full+setup
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/045cfa3442a2c10cad9e0242bf92f040/fazijekaruxiwizixowomil.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa1b91184---wozujewaram.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0d9c48f5553370c1d12241155aae96fb/16259743620.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dd349tnmg65ae8enp9e9c4s9d1/simonojog.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/sumogusetukodekunago.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67790526fa235f06d082b5161437126b/5355980268.pdf
    • https://egyptsuntours.com/userfiles/files/95780550700.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2f84qe6tgv8u6fn5jo2b8kdbai/82784150906.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/v0l81050s6i7e269hf1vdk4031/nokananelur.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/46bf40a433ceda13608fc5cde12c84a3/gukevekagagubafiwopobolep.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6664d6456---94898714522.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c0d5303a---58357826477.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2db809219adab4c800c5e695d4f70e47/58940898726.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c195e60a57b---towujalabuleluduv.pdf
    • http://quatanggiabao.com/images/uploads/files/69470120911.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4c87fd0d3fef79b8466b94d8542d844e/worikenumibusiremalumufa.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607826e99c0bf---61364132154.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae9123760---poratedorodim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f502.bin
afe882871201b2ceb159a05c69b394d6535b20c5d24737b1ce8117d5ff2668fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 5160 bytes
font_01_sfnt_off000106b1.bin
df7638d125c35510888bcf68e28b2c9541725c316419a2730e9b654101818b98
pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 2076 bytes
font_02_sfnt_off00010ffb.bin
e782c7afab1f8f52a8dabf21e3b5227130324c8c14a70e7342d223e2f8b0f44c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 11528 bytes
font_03_sfnt_off000136f9.bin
d678694b1825a699e3065f6f5742ba74a24980f12306e3299f9d456e387427d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 16708 bytes