Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f009c67acf33f25…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 18:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6f87829fe348a385b54a6bb47e1c525 SHA-1: a071cdd90da7fa4406a4d6704950d2fcab5d9d79 SHA-256: 8f009c67acf33f2500b5dcb6f7bb604ac3d94021603140301568ffbdfdd2467a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or trojan payload. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=samsung+galaxy+y+mx+player+codec PDF link annotation
    • http://dissanna.com/temp/fckeditor/file/76520915365.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/ziwuxuvuparamo.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/wofojaj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16134556d2d848---kizufe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6c10bbc1---84023759814.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/kijalaludopaseworute.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c6dda217bf213cc0a741beebd40aa233/rinibarot.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/44017124921.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/netimigesomivevo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7159ea354---kipeju.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210914160104.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/zisotatatisovupezisub.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wowenuzexirawoxa.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/66831981229.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/doxutikatoginu.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/sotudedetezoteru.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/39854175408.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/85051968143.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/dutezofaxinebo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/54a9a4113a21698ee754c1ae5bb6ed44/75074011645.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zizivaxajetikesugoxu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/41397147256.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6df1c15c6cde7c5c4c102b5f5c8a1957/8427444419.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/rivagitasesoxososiki.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141acfbd4fa8---bopawanamosipif.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/11033092026.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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 17568 bytes
SHA-256: c77667be598f685614e17b4a816560c5a3200a25777c03a4c6c435e07f1c2a0a
font_01_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 11060 bytes
SHA-256: 54c5303bf8de84efd5a7da32584b3cc2a6dd5516877fa3538010a66483db002e

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