Malicious PDF — malware analysis report

Static analysis result for SHA-256 268d850962024ee7…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 10:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38f909150d7c944219a5bd8576a90339 SHA-1: 131a172aee932fc4484d9c13466f38626935e3bc SHA-256: 268d850962024ee76e124c6d018971a53f1686dc0faec58777c3164c1304033d
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the document being a link farm, with many URLs hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content or engage in SEO poisoning. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=assassin%27s+creed+bloodlines+rom PDF link annotation
    • http://kiemdinhcan.com/Images_upload/files/nedirilila.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pakegefirenifadis.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/28050489829.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/kipetajuwufekavutimekub.pdfIn PDF document text
    • http://mdtrend.hu/files/file/muripumuwebib.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210908161137.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/duwalidegusi.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/88260179463.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/rupolazumunumutupefe.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1d745c680---waped.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d413e8743---50231910023.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/mebumokib.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/fevenomakoriwavozaserig.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_152248.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/jisiparipomubewerakub.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/95824028504.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///zedisuwol.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/vuzututa.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4f8cc193---55970633529.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/67471217996.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/nakodakeni.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161364b959234d---84028406122.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/25936769403.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/palibuzab.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_off0000c3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 17896 bytes
SHA-256: d6ce41142d9d12a2ca86d1d94864b787d22597fcd0d15cc073fb19d0634d6a41
font_02_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 10588 bytes
SHA-256: 4555313b4c6b67338a54c067710d6c1e9edbaa463e408b8c131231a03d0c479c

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