Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a3423af871de70…

MALICIOUS

PDF

90.8 KB Created: 2021-09-12 01:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93be1eb90a7fa3d24603a6b4fea1faf3 SHA-1: 4fd700efa390a5fadd9c3dedb1f0481847e4ba12 SHA-256: e6a3423af871de7003e45932296376e7769869b1869f98c5b34fbf7309a7894a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the ML classifier's high confidence score suggest a malicious intent, likely phishing or malware delivery. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=getting+root+on+android PDF link annotation
    • https://jeevadhara.org/work/london/userfiles/file/farodozubowaro.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/83411783713.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/3310059734.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/xizotedatodaxejideba.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/31770666323.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/71784421165.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/13910315849.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/tugeronotininojaduxede.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a11228d2---netumifimezevapil.pdfIn PDF document text
    • https://emprenderem.cl/files/togogijadeguwavetaj.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/zakusimurapaloroniletedu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/68219313943.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109091702516756.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/novibilirodenakogeze.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68158778933.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/33026934062.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/60076445509.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/87647707173.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/13875637798.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/74297062705.pdfIn PDF document text
    • https://magerp.org/upload/files/49742748443.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/dekofuzeki.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613130ef457a8---38972802574.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9185517a---xututo.pdfIn PDF document text
    • https://lapdonline.org/file/78474195401.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

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_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10248 bytes
SHA-256: 8432568c53e3386352a862cf57dd28f4858f7065789cc5f487be94107a9540cd
font_02_sfnt_off00013006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13006 17388 bytes
SHA-256: 6f2cf2e50bc40391578e0633ddd6fceecacec466270777dad787de7a34480a41

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