Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df7bc2200b7d6a3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 08:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d92333fc339506f24405925a635dd7c SHA-1: 3cb7437c218302fb16ffd7c5fec0a95bbe9780d8 SHA-256: 8df7bc2200b7d6a3079f139b76b2b8f80d72d6ef18a883b5fcc4200621c7e2d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://khotelmarket.com/FileData/ckfinder/files/20210919_0FB15AC4EC1E281C.pdf In PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/76942743609.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb8ba8030fe55a42970d2fa57ff73551/75695644625.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/95162574748.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/22394000938.pdfIn PDF document text
    • http://trieuduong.com/images/Download/18850122669.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/zoweponofelomemo.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/41149116727.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161340646b53e2---7599222110.pdfIn PDF document text
    • http://hanauhrova.cz/files/7874219858.pdfIn PDF document text
    • http://sb-78.ru/files/file/xiwavuwofoj.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/nokezabuni.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/zavorodowovuwer.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/30992435062.pdfIn PDF document text
    • http://koutingchina.com/upload/files/nerojimutufomifomezejifu.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/xopizepibabejidemumepalew.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/70735560636.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/jipabuniteruze.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/70720814232.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df0bf0316---40230968809.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/53899116858.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/36345433425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+delete+app+on+pixel+3PDF 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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10468 bytes
SHA-256: ff3e32b91396d50b4f0aaebcf1255ad21cef1de42dc70dbfd6a63dd55e199f05
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 17444 bytes
SHA-256: b8acfb068f132219477af8ec7e57650ff2fcff9f6387eab940cae5174cb2abfc
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1