Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f90058006fa5cd…

MALICIOUS

PDF

92.0 KB Created: 2021-06-25 18:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0fc21a137c53cd2c9aff2f672f103d SHA-1: 771c3e77f927c442bf75341851e2819df1d38a5c SHA-256: 43f90058006fa5cd7d3dc34ef7fae735c2a6abe20870d2c19550e41f413f2038
176 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 compromised WordPress installations and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef296b5df---zopumamaruxefopudegagag.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8f2be195fb382685519666769dd71e5/16822896329.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851e1fe3d9d---20423043514.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2c53eb93c828321cd85e95d9a7bed806/biwadagudawirel.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a29f130d---lurupeji.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609342b9987f5---9898284566.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8e3ce8e---23409450205.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/vip0j5febn2np9joluhn5repo0/4843994007.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4664a72fd77c1f8d71c369ba233dcf49/95071395494.pdf
    • http://ff-engineering.com/userfiles/files/5645358214.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95eeb7ccc1---zopiseve.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/funarosewevami.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f020d74df5237c6906d9133b3e1e1c3c/xegaxaguxetokovag.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b7585ba577e---2632787192.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1a271f883---3101658863.pdf
    • http://aceonlinementors.com/userfiles/file/19217517384.pdf
    • https://golf-tout-terrain.com/publish/page/file/63316798621.pdf
    • https://burstallconrad.com/editor_files/file/vusedefigal.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ejfts3fo76km7c6e29mqbj15q5/voxategeladizofud.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bbe335f231f1d173874b01597bddc250/98563474644.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892e6d57e36---12888286474.pdf
    • https://firsatpin.com/calisma2/files/uploads/fasisogijudoforamizip.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a58f46efee408c11afadea54d53ae61/wobijedalitamixotef.pdf
    • https://topinsolventa.ro/userfiles/file/52463300709.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lysosomes+in+plant+and+animal+cells
    • 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_off00010350.bin
9a211d07669a1928036edd3213314789fbbef909385d2ce911cb1ff5565d81b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 17376 bytes
font_01_sfnt_off00013090.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes
font_02_sfnt_off000148a7.bin
8b1f31eaac994823fbb723671e30d56fc8c9df470bc5768a48aa246a3acece94
pdf-font-stream PDF embedded font (sfnt) at offset 0x148A7 10648 bytes