Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcac2d831491694…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 11:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fac113b1285f63433695846cb5e84cf SHA-1: e9b144012055ab310c599329398a2a1df7ff57a3 SHA-256: cfcac2d83149169434b4cc967e290bb8b19a0f24d55dc52ab71e261ae451a3c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=dualisme+model+pendidikan+islam+dan+sekuler+pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/9l2gsrrbvp4lvctlps14dtg3cq/49936132212.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/pf20aegchs4f051r9p279ep5fn/bagisaruj.pdf
    • http://schodylux.pl/userfiles/file/paponakuvimukem.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/riruwixajefo.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/60020415433.pdf
    • http://computerdoki.hu/user/file/damugipinibaferevewugegup.pdf
    • https://abofahed.com/userfiles/file/65277924525.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/bonewonusanokur.pdf
    • http://tsyrulnikov.ru/upload/file/kanitogaj.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2916285019cddc4a93aed47b26097fa9/24437378577.pdf
    • https://cian.hr/userfiles/file/xaginutevefofudosan.pdf
    • http://hakkabrothers.com/userfiles/file///4257625680.pdf
    • http://vetranhtuong.info/luutru/files/75535539893.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd7aedac90b---84791741521.pdf
    • http://immobilieninvestors.de/userfiles/file/34713705086.pdf
    • https://aronabritcan.com/userfiles/file/12084336227.pdf
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/99261400692.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/70567762849.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3794f71b---zunozipemebamufoniw.pdf
    • https://subded.org/userfiles/file/menorakugisaroredapujut.pdf
    • http://charivne.info/images/file/fenobukimi.pdf
    • http://elma1.ru/!upload/files/jiwux.pdf
    • http://gazosilikatnn.ru/uploads/files/goxumenojasede.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/xikeketekelubisuxuw.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/tulipekunufiwexekasob.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6726a8391---2854574296.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/49da27ba784164a4265807840d49f7a3/93628240728.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e675.bin
544a83de88de6d28a2fe5ca5dfab964df482a0ec910c2523e5ec28e6fcb3ab79
pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16600 bytes
font_01_sfnt_off0001114e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
font_02_sfnt_off00012965.bin
3dde69a51968126b25262693be9020fee4ac5e706d4c451f0e5039598ab1f3cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 10752 bytes