Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a00868f72462a8d…

MALICIOUS

PDF

89.1 KB Created: 2021-08-18 21:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66713828565e6ae30ce09cc0c2b4dcb3 SHA-1: 158ec923022fc7f05283b241fc5f2c6478b3f835 SHA-256: 1a00868f72462a8d06f58b7d32aa3f2cb002bc85939bc6182214cef1d1261d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=sea+fishing+boat+rigs+diagrams PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a624116ddc4---riwoxiwin.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada19b77604---78588441032.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac4fa66ed---dipidorunojanesinopu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/20ca139b2b567de6631b74f6325b8741/7517080055.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4cef7d1d13d45660a632ce6981a7e433/55352394080.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/26692321547.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/36901618139.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609692e3e0c12---wusalegew.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/43594858051.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210516193629.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/loluvogaratukodevukexuzun.pdfIn PDF document text
    • https://daismene.it/file/rixurupilenoxewevoxul.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/1da01f1304b6b5004136f15b327513a2/38386797556.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021080315481495245.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/pagoxapesemobugak.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/letejanawabefizuweb.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110604617071---rorirapupizajopurilug.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/823f0093353d736da67ff1660b652f71/25814761589.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e1599da7f18a8ab5a09b39331e65a1c0/18824635096.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/tuwufibemavino.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/42292989311.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/tuzalilapugofo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8f689bcf39e4745b8fd1acf3c8768d04/mawugoxivefiwitolutuwut.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_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 16716 bytes
SHA-256: ea83997f1bb95fa7555f1fc18510276c5ba0ff749e7f0619fc685ce9f856f08c
font_02_sfnt_off00013dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC0 10968 bytes
SHA-256: 476065f822c1f7f60a306b7c052cf2259d8212b2314225e8a9bc26744cb5f9d5

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