Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7166cb7926def9…

MALICIOUS

PDF

110.2 KB Created: 2021-09-02 13:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce98fe54c6892a69d4a253c862ef763d SHA-1: 584e296b09b043986ea6ef83da9769b011462fe5 SHA-256: 1e7166cb7926def97b7e4066f41425494d496439dd93493590ced1daf31b79db
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document's structure and embedded URLs suggest an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4d8141171e8d2ba6f09983e5df2116a5/safurotonekak.pdf In PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/befuwoxun.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b265c89ed88---60985144960.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/29764041464.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/bijufigukiralolobukofabe.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/xugorir.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/55364835068.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nogotefijogofovekujap.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/takarubozewomesusefen.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/37850928092.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/477198915.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607439ee469ad---27906044165.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/xijagesopegefakizujo.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mifukepenes.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e1ad305291ad18e05ecfdc4a166ab0b4/nomujenasopuz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd507e1ec4---63034512798.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0caedc1ee33facda9240d0c9a4e9e027/sefusurebajerexojiweb.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2jsdpt1dullb76o613btgkb7tc/25141700620.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e7186a219dc33f2d5c69663d48284d87/ruxabeji.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081490caa5c---vemiduvemam.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd56f154f---venoxovumiw.pdfIn PDF document text
    • https://domilot.com/uploader/files/favekakiraburane.pdfIn PDF document text
    • https://tsegypt.com/file/95428449984.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/10346503.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/93621995946.pdfIn PDF document text
    • https://dragulf.no/files/file/lokupanidamaxavatebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=solution+of+let+us+c+15th+edition+pdfPDF 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_off000142e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E6 20684 bytes
SHA-256: 8eb7b1aacc68d1c660a2c8d8e939bdec1043ea825680f66443ea1bb1041aba2d
font_01_sfnt_off000179a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A4 10816 bytes
SHA-256: 1eac0051c15d284c46b907832792fe0b7fd243df9e81be9c7457237c251f66cb
font_02_sfnt_off00019298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1