Malicious PDF — malware analysis report

Static analysis result for SHA-256 b689dcc95746fb84…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 06:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f82b2128b125fbeef9a6928846da2f35 SHA-1: 6b7244f558aa7a7a45e1e090795c8a1fd281e2d0 SHA-256: b689dcc95746fb84e273a6985ab0b69abc6efae55f7d5e3f4edfd31077a924ad
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised CMS uploads or disposable domains. The primary function appears to be directing users to external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://smidgel.ru/uplcv?utm_term=yes+god+yes+online+free PDF link annotation
    • http://mebelhotel.ru/userfiles/files/vatijutemefetirav.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b02c6b8e85---jinevelikuralivuz.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/30748209419.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/20464242994.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/dubaxokaworinadilugaf.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/radolafagelifede.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58840096731.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bca22d300---zefozezovadovopesuzem.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/zofaditosefe.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5f0ca903c74127dd93861c6adebfbc58/41519538288.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/towutojaradisuj.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/7246056043.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a12357df92378118c780e10057a72c63/78222581775.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/44403019691.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/77093195270.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/zejowinoka.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/ragivamutuwi.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/33881862825.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/91149983075.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gixelijafibijami.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de0e298ed8---zidek.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/55288524857.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82515992591.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_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 17288 bytes
SHA-256: 9349de94fd28558aa3ed033027889050c56f5f7d55bfe0eba184365f3a9ea051
font_02_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 10368 bytes
SHA-256: d8fd669e8d6b0a71441026fedca9f4bf489ceae7b40e51db1ee6152ce99bf310

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