Malicious PDF — malware analysis report

Static analysis result for SHA-256 9faf7b9bfc69438b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 03:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf6a1935dfb37c3fe0e53f216cf74b4e SHA-1: 7b6155a22147d435ee0b89b053d564d33f3c2cab SHA-256: 9faf7b9bfc69438be0d7d3b2c263ee7d8057c36d1595b78ac6f2d3dcab7b9a2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristics clearly point to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=snapchat+account+hack+apk PDF link annotation
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/xatonodanalovimofewuvofab.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/fipumoxurilurobasoz.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/23312826541.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/zebaxolupovozawevekanop.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/nerotozubumobapejevi.pdfIn PDF document text
    • http://htwy.com/upload/file/zogerebadojojudodo.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57481365844.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tijuxugoxojiseguk.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dejigurerudelegitene.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/46285206313.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/tizalilelebonesa.pdfIn PDF document text
    • http://ternovykh.ru/content/file/94854220506.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161385e12d8ace---19238785263.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/xuwere.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/gokeginopozufafari.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/81773682889.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/luwik.pdfIn PDF document text
    • http://hrudolf.com/userfiles/47657913814.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109081548573682.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/85414323771.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132781e3809c---bivunisedimuz.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0f6ed3eabb7372a3b157e1be35f0d985/wujudowemozuzipevol.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090920334973499.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4d461dd5---pilituvalavutib.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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10200 bytes
SHA-256: cc60becd4e478fc9f50111826967829150abdd5be2e293532868cf78fccf4e64
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 18872 bytes
SHA-256: 05376785294bf4aaa26f218ea949d2965fd5374a7564e6da61958b32e2e0b491
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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