Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af6638523cf10d5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 21:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a514fa61b0ee1da1f29f7a87210a0630 SHA-1: d9a69077699d6ca33152ed1801d236c80c5dd965 SHA-256: 2af6638523cf10d57b7b6510231bd89133bd5c75a23a82c0beee8a557594c5d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://szermgrt.hu/uploads/ckfinder/userfiles/files/koridi.pdf In PDF document text
    • http://phunggia.biz/userfiles/file/situmimanibebituvewigovo.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/pimivon.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/60437536837.pdfIn PDF document text
    • http://pronobile.de/catalog/file/roserugel.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/famubosakawogo.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/fapuvezufexin.pdfIn PDF document text
    • https://people11people.com/uploads/File/rurinotuvazedilexuruwov.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/15866869866.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed279d919d---dubusebinogumekunom.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/witovezada.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/zadixufilawewewapemol.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090603091341.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/jinosowojupu.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/12940308385.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/tusovalexekudisokefex.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613711174e229---94877195839.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/24633219808.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136693fa5347---63207758257.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///zitawevinavux.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/96733168482.pdfIn PDF document text
    • https://etadelloro.it/images/file/linezatalewudepelidakibus.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zaxolelegaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=geometry+law+of+cosines%2Flaw+of+sines+worksheet+answersPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D3 18728 bytes
SHA-256: 8f2db4b5d5b13ea41cd8c31391f2a8d4def232336d6414d8c516f3a7ccad3b94
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 10968 bytes
SHA-256: 7f4c9d457a302612440f487d9bd1afd98e11cf08f0b572e77d288ce8f9bdd621
font_02_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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