Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7ed786978e50c5…

MALICIOUS

PDF

68.1 KB Created: 2021-09-23 16:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b359de3e9e44ba6bbe45b64f2609a5b SHA-1: 35533ea88f84a4db5595d71f872d8b9f57e821d6 SHA-256: 7f7ed786978e50c5a4178555b23073356ee02a06cefeaab1213a8b8235d829fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable links. Multiple heuristics indicate it functions as a link farm, directing users to compromised websites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 68 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://infrive.ru/uplcv?utm_term=exchanging+encryption+keys+telegram+video+call PDF link annotation
    • http://zs-oilfieldequip.ru/d/files/99721166054.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/19682853502.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xamuminejadonur.pdfIn PDF document text
    • https://mmtours.si/uploads/lidipafofodizoxibeziv.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/dolulobivukufafofogow.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/78088403224.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94856909018.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614970e7d1071---gigex.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/putibomiletowavilobajenir.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614992993c8c3---belepututipafidiwazegu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/bizobovozaximigogova.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/70025015061.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/risujelezuxunesu.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/81643941396.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438bc407f66---70713245501.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/wikatanet.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/didowizutebuvopumum.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/88789042077.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/bepozak.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://rosettes.it/userfiles/file/38628778448.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_off0000af86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF86 11320 bytes
SHA-256: 1f22e583ac12f388e055878a96823adb294e9817d07e2d480939fd9fca9cc93e
font_01_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 13280 bytes
SHA-256: 421c1f1a71e220e55df8f2f2df1bb7e9f1d84c8dbbfefb462921f31dd66065a9

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