Malicious PDF — malware analysis report

Static analysis result for SHA-256 17713cff15728aae…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 16:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2312cb7df1edb44dfbd685c4c641e0b1 SHA-1: 019c4d3765cbc5a582dd8320dd41f7a0e1ef5b91 SHA-256: 17713cff15728aae3dfcdfdd7c799dc5871e518827e175cb3fb7da7e830dad77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to trick users into visiting external URLs, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=hitman%27s+wife%27s+bodyguard+torrent+download PDF link annotation
    • http://goldway.jp/upload/board/file/7203571794.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/62520194478.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b24dd6c1fc2ba0eaf114469daea9feca/49088867447.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cntmt978dfsp9hb0fr4kp7seio/88660567417.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/bululoraribixide.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/puzomeserul.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/boxururuxevogemi.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/perus.pdfIn PDF document text
    • http://moderna.technology/fckeditor/editor/filemanager/img.php?file=file/36492934393.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/58731856371.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/januzikerav.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/neromifurifeguwilesax.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149f85599c6a---vakazepejokitimal.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/soranukedagovifawapa.pdfIn PDF document text
    • https://melz-feu.ru/upload/1351178603.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631721342.pdfIn PDF document text
    • https://bursac.net/userfiles/file/siwaposuruvojikivubaril.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/71196665723.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/fikedokej.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/mizupiwuwawime.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/28817836955.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5cbf97bd0---88740193358.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/80464484276.pdfIn PDF document text
    • http://receptlap.hu/files/togatozutujaxazo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a1hogjaar2m3ojucap4qknad4s/31798531788.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_off0000b104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 13996 bytes
SHA-256: 208e9b3fe0cd0f3849526f9162f80c05e08f27ded5ff44a368e2ee7f1a85ec8b
font_01_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 11160 bytes
SHA-256: ad515e5f6f5f8ec3b32889b2a0f4698fe77d41f703293d5925bb5020d3743f27