Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29da98a4a7fd1f0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 15:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe6142c2f9da6da416c1a6e54ed625d3 SHA-1: 7e989f2010acdfd2380f632d6eb7a05909f48fc4 SHA-256: d29da98a4a7fd1f03046b7053384228dee126b7530717a8c5bb59c5efcd5a7cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=art+io+games PDF link annotation
    • https://songhong.info/userfiles/file/pibomikemir.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/35295828379.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d448a8f3b---vujaj.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/wisagetobovixijorap.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zurovixuko.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/foxulewiwezuneg.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/38746385845.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/8205380516.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lonasegixe.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/10515635230.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65343712234.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3c0dda2---winawejoditakirukijoras.pdfIn PDF document text
    • http://berbun.com/user_img/file/jetetakimumomotoveruvat.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109040909228036.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/12558866066.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/wudufudabel.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302efa01122---79335693567.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/funufenodi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/029026b2913da635d53bbb3f22651885/tobofojam.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/ripuno.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/58389804657.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/vamajozoluge.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/wekadilit.pdfIn PDF document text
    • http://szpk.hu/_user/file/40365106140.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210906_74C5E33DF7C696DD.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/fenate.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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 18484 bytes
SHA-256: 8c74e04452772366042eec566855b4cc7b7c98268f64d7a54a5e070398d1b96a
font_02_sfnt_off00011c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4A 10284 bytes
SHA-256: 675dd2c647d957896b80f050155b72a64629075c36795f9cdcf632a41a5475f3

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