Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c92ee197bae3aeb…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 05:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 231239f7b0e12a43a142bbe9e3fbeb18 SHA-1: 1f60f9ea167a4039c6515688d590457d995d1edf SHA-256: 5c92ee197bae3aeb648a7173ab0e95208020547df8fd9affc3da85fbca7e6651
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://retroldn.com/userfiles/file/zopokixizosi.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608da1ef3cc21---bojakewojaxumaxato.pdf
    • http://klhl.com/userfiles/file/fajajotiwulututajowi.pdf
    • https://ifbscalidad.eus/files/galeria/files/nobuxisotelubosejag.pdf
    • https://pnp-studio.com/fckeditorfiles/file/37383925190.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f11957bf9---wujalobenasasekiwupinaxa.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074acd7393f2---lotisaluvaba.pdf
    • http://fd-health.com/upload/ckeditor/files/44692467420.pdf
    • http://langeline.com/ckeditor/upload/files/rebin.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21d478a28---gasufevofivurinu.pdf
    • http://mramus.com/fck/imagesfile/34154654613.pdf
    • http://lmleadmanagement.com/userfiles/files/19590246309.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ca411f97e31---7809425137.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096afb6e514c---3995992047.pdf
    • http://rehahomecare.com/upload/editor/files/fuzuz.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a380523cf---3861888671.pdf
    • http://ecolservizinettuno.com/userfiles/files/mozimilidiguwigulonem.pdf
    • http://www.prieteniitehnicii.ro/documente/file/68347939562.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/76988269ae9cdd80ce4d9a224fe9f86c/vuzurinatodonosotur.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072be1244e07---32541934419.pdf
    • https://ahirealty.in/admin/userfiles/files/gafibiwasovowovigakike.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/gagiposupuke.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f512d63c92---60582731035.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/bedotipulovudat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=interview+questions+and+answers+for+experienced+in+asp+net
    • 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_off0000dbd8.bin
efe1cd29ffd916f83fe71e94dae3660e7eea84358085d78eae601b8f2e0f2ed4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17636 bytes
font_01_sfnt_off0001098f.bin
3c51470a6ab0dc30d6fd9367b9566790a79c465574375e76dca6037da608c972
pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 11020 bytes
font_02_sfnt_off00012334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 16792 bytes