Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad25a508894512fa…

MALICIOUS

PDF

70.9 KB Created: 2021-07-16 14:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: de984d74228a26e5ea5a28f61cc6b162 SHA-1: d397bca7d24886d2a4aeeed68821e9dc8e0260e1 SHA-256: ad25a508894512fa8d79cc98d4a1b19e3c2ee41f51c72acfab67a841f46bceb1
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

Heuristics 5

  • 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
  • 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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8ce35c9---56749131255.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/dd0b484aa38b83573ac49536113fde73/77713952178.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9b172b191b0d6f8188bf4c0e5055f8ee/50987795326.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/aa3f768c1b1ff7f17537b7d6738a7f14/94112057971.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/63q6nd2vsp2c66j28bsq0u5khu/nodexamigawizavin.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b69f9196ed0---fepoxemigesotexate.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a3589cfe6---92258901874.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sebevisijev.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f808b207c46b8d849258ee8017d0473a/vujipudiriwu.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/29194937242.pdfIn PDF document text
    • http://megalaserasia.com/upload///zefifezodisemov.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f3e7792e7f8a68fa7170da3b3d0e269c/fetiwipizuremoxezimome.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/2869917508.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/87482577287.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/r7sqcfrgice49opka8p79chh30/18819497343.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/fiwujoredebowimof.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a81ed7cf71fa716938069203affca723/24991246376.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/duwetelaxewusorotozuw.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/faterozixubevadapomawina.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/zuwisadajevete.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1815296950077c8002623634c7c9b4cf/41822088019.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/57401212164.pdfIn PDF document text
    • http://nktrading.qa/file/files/zadujunagijapop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sandfield+pitch+and+puttPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 18184 bytes
SHA-256: db8814cce42ddf7bf1eeacf542112a38fa2aba6ed03a1b83951e0b9db92fdebf
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10504 bytes
SHA-256: d9abbdd19d07ce784c0e3c47a3221a4153908006770bc2df2a5b551a5b232092