Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16cb0dc1625cdfe…

MALICIOUS

PDF

83.1 KB Created: 2021-09-25 13:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d95f145cb8c9df4763d50c34c7a2684 SHA-1: 22f8897d0fce546d4ec0377daa501ea16d93be8c SHA-256: b16cb0dc1625cdfe2206f099d2e5afe73b4af0786f72f7b81f6c3f66d8f45bff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://loadcell.vn/Images_upload/files/33983255205.pdf In PDF document text
    • http://asbazainville.org/userfiles/file/sosokikar.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/11921845247.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc67cba07---56924677299.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/pukago.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/dapozibofikojazitujora.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/tixugaxivirijajifa.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/xuzomevisejuzoropalapa.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/gojolefewemuboganetuzezob.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/soxujajudozun.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/52045934936.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nt383oavvbt0k53to2hbk0ppcj/bugalafalolixewom.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/17100291133.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613409846d351---95529818644.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wemajamomimimibeva.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161349b9320d65---36038063307.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/17065475046.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/1140462659.pdfIn PDF document text
    • https://dptech.vn/uploads/files/94726686434.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/18497261357.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rixiwuxosexigibipagulita.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/xuvokamejuzew.pdfIn PDF document text
    • http://symbolfoods.com/files/file///gadofuxufoxinurew.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rajomosuriwa.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ver+peliculas+en+espanol+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 18096 bytes
SHA-256: a948cb43126fbd4ff5f5091a2d9ae4cc8fc8152411dbef63d01f5bfc09e657ad
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10340 bytes
SHA-256: 0a1675c9fd24afbfeb23b1820f822c6527be0b0e93fde79b2fe68e4d11422e40
font_03_sfnt_off00010b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 19564 bytes
SHA-256: 4922b421ea645a4a92a6e70d183d72a0d50785a4d8631762754c5885c082b49d

Open this report in the interactive analyzer, or submit your own file for analysis.