Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c498edd73c9b9b4…

MALICIOUS

PDF

97.2 KB Created: 2021-06-30 17:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d690b2b72456ecc2d038a099807ed42 SHA-1: 2fffc3d361d9018917ee14c36876ac96d069abb6 SHA-256: 9c498edd73c9b9b4e96d6454de08469af859e21f14163c583adb1b4600bb99db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as containing a link farm pointing to other PDF files, some hosted on compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. The embedded URLs suggest an attempt to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medtek.vn/storage/file/25628473808.pdf In PDF document text
    • http://temple.mo/userfiles/file/rukibutisisuxonujitetumib.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/aece3acc52a8cb521bc0ae0a875b6cca/foxakekezirikozepepotu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/85101190156.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a591i4kh765424osnkr51ih6k5/81264590753.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a8030249---puxepozezakep.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160916e9e88f56---64184267926.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/gepopegijazesapuju.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210613_235456.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ae048e80---fatorokefanosuniligi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/05091e0444163e0c5e9ce1ed5132ae0b/zefekenesipozurutupezupil.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/rawiserepaxukube.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xobep.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74675860691.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7100c9b1---vixiguvi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc244cc7d---12926537440.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2a527820f93d5994e9e45edb8fdabd90/21715878980.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1676108e8d---wuletujiwinamivakexub.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fkpll6dvhvr21uliad4cfre916/runitenezo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/5nk4dnga7h3q3omr38vs5kf1j2/vesiwinowawokiwexuwegize.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae32deccd51b465fedb425f496c6b2b6/8814321680.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9c08211b---wimomusi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/721eb9c1d9ca35275615a5df6f629244/82973557723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lee+bowyer+and+jonathan+woodgatePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 17672 bytes
SHA-256: c81dcd9fe2e27e85f8ee18a611a2895c19cc91b6dcaea04c576d2c8b0a9bef2c
font_01_sfnt_off0001459c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB3 10648 bytes
SHA-256: 5326ff46c23f6a2a6a3bbf2087aeb9f34c02095c6f1c5ae30652f1d38a9c9276

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