Malicious PDF — malware analysis report

Static analysis result for SHA-256 158fc8264c9561f5…

MALICIOUS

PDF

90.1 KB Created: 2021-08-16 17:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 56a65a15ad2a193d54ef4e3fc3b5443a SHA-1: 1d0c23c409486ac6a6955f3b93a45d4fc4be568a SHA-256: 158fc8264c9561f58da860d44f73a33843b1453bb1fb4428810a3e62cae6e213
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ash-graphy.com/userfiles/file/87523237856.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/xinodinemadoketosati.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/dodiletimuzawomogewol.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/1666867374.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/75872091196.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pelojizajudenovuvojegino.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/xatinap.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/dixudomakukabijumabagaku.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kegujazuvewevaximosabube.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/davuxidilajorujepimerupa.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/52481193702.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/faq996892u5vbq9d0o1qgjd7b4/wefigevumuxumumabimepuma.pdfIn PDF document text
    • https://ms01bet.net/contents//files/zamal.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/65203245086.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/h7lv8unpnnobjoob1g94mn5o02/52718160837.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acce5a7a2---zisok.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/si9ba8utuuhapod67dkhgcl5i4/pasalupukob.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/54d6875af322cc1d88e21ca94363c46f/74662235943.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/15aa4764f8d50b02319f0b8d1ce180e3/winukaxapeda.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/momuragoxemola.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aafc0ea56---94612910247.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b256ef057---65551453921.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afff52ed7e6---basilisikeduzemabap.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160841460c12f3---25797624069.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/94219017902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manual+de+solidworks+2019+pdf+en+espa%C3%B1olPDF link annotation
    • 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_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 18048 bytes
SHA-256: c7f0a6ec4632ddab7f802505cb6968917cd85681f44120ad6e62fd6d8513714f
font_01_sfnt_off0001257f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D96 11332 bytes
SHA-256: ce4502ae7fe35a70024aa561ed56b124dbf7f3617631ade9d8a31ecd0ee1be5f