Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4281df84c6cff42…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 12:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c94cd656c1a35a13626cf99519f51a3a SHA-1: d7195925de8e1a2faa560d58b5fb6a982b050ae8 SHA-256: d4281df84c6cff42831fd01435deed3faf7fb73cae01b70e84b20e3f2f52ecbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=my+hero+academia+season+5+ep+11 PDF link annotation
    • http://www.angels-rest.es/ckfinder/userfiles/files/19510137566.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd641c7687---xonukaxet.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/vezevubebu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/511093eb0cf9316980d6cb394661fbae/8708362889.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/xidufigiwutemusuzim.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/69639177374.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/79732736148.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/pogoliwi.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/18911128359.pdfIn PDF document text
    • http://quinta.cl/upload/files/83232612501.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/rufutitigugud.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/92852811353.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/78572792979.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310ddfc1529---rutoxifaremobotazilepew.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/wavekotov.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/72085357784.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/nikaloxozizulifaxir.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/kenetose.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/tunifukibigumukureji.pdfIn PDF document text
    • http://belst.by/upload/file/68794590098.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/bonukipiroradevorufijag.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/82823870043.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/13570125885.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/151402595956.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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 10928 bytes
SHA-256: 8fab120067f3cf419e306c100745847db9df3a82aa55a63cffc688590141b843
font_02_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 19280 bytes
SHA-256: dcc73ea16c4d2b0f8063ea38ae8a25b27aa7c6c8e1281656a5b751e432de2695

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