Malicious PDF — malware analysis report

Static analysis result for SHA-256 59206a7ef84b8883…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 11:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac0048f7c93511d93781c7650e8cdc1c SHA-1: 9c0500d4f430e69b109928cd818b228c08d5b99b SHA-256: 59206a7ef84b888305ddab765d22a6e88f2bbb219f187c59f4697a73a8f01a33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing or malware-hosting sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=lg+tv+mit+android+verbinden PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f77154a7---52501425999.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/dulagalusejaverufadike.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/xulufezopega.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/kemudupuraj.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/kipisojozenajirotote.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/xozudob.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/77482429139.pdfIn PDF document text
    • http://eventechsite.com/files/files/gatupawe.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/56718539145.pdfIn PDF document text
    • http://jn-zhsc.com/upload/29324270578.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/55985350727.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/xefodogipogi.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/rolizodebalu.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/mosobuxit.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72495849198.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50b9c56f1---71922124261.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/3758001016.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/wetukepot.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ad053f43---64707278247.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/wegodunu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614237b4b415d---8531038169.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/sununepo.pdfIn PDF document text
    • http://myslizdrave.com/soubory/rukujoju.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_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 10540 bytes
SHA-256: feb1e9ee6418dca6a1ce87249e555b0db82b6bb8d1788f943a9bd9576689b563
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 19096 bytes
SHA-256: 80663cd6820be926cae90d0c6ab464541681fa0366d82450ed66e60429a34965
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1