Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4a8cc8d88bc469…

MALICIOUS

PDF

73.7 KB Created: 2021-06-26 10:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aadf67060ff790d3f141b0a720d59096 SHA-1: d5e32234b22734315221a9529b3f6a48edfc8ac3 SHA-256: 7b4a8cc8d88bc469f400844f47994b6ba421b04460d5f3c1e0457fe2ca202f3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to direct users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b2a46fcfc---detedag.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46825987366.pdf
    • http://www.look4job.gr/images/_user_na/file/79929570706.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/37064292621.pdf
    • http://www.kilincsweb.hu/fileok/file/41738798890.pdf
    • https://mmszke.hu/files/file/xowesawovezozixigixaxosi.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099850fa98e8---12975312962.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3ab5d10c---derojedigofujun.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073989c1ca2d---vamomur.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa74566d1d---kawujukigegosidabefiramur.pdf
    • https://ddshower.com/ckfinder/userfiles/files/12938406117.pdf
    • http://on-video.com/movies/movie_data/file/36721018843.pdf
    • https://lentes123.com/aym_image/files/38539944923.pdf
    • http://poiskvod.ru/images/file/rixifusew.pdf
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/rhs7p0mmp30u9spjmqned9e0i9/julitebojiwum.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160819c04deec8---61623578464.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e27af4165---nokemiwiwifokikifi.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98a267e55a---2099994544.pdf
    • http://ajtoablakcentrum.com/_user/file/xogutusizeli.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jqtbiehrdq13si1vs1iccnvt74/69971400649.pdf
    • https://cbconsulting112.ca/userfiles/files/beloduzumol.pdf
    • http://alpha-cp.com/userfiles/file/bifajodurezaz.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6i5leq9j7cv953em1on3ggel8r/24553613777.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079473381750---71637193004.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=roblox+tower+of+hell+fly+hack
    • 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_off0000be11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE11 16792 bytes
font_01_sfnt_off0000d623.bin
3eec9cf6228c12cd1a30bbf940d9526cb3e2298815f021102488b53186b9b533
pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 16812 bytes
font_02_sfnt_off00010116.bin
d5c6cb3cfa6f59e96716979acf425de039cdd1909a7dded4913fe53af499d43e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 10648 bytes