Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddf0902ab40522e…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56867a3953e73b1960dc63486a17a078 SHA-1: 700e3b1c6038ebc3b5ab542beb8e5bb7f8baeb01 SHA-256: 9ddf0902ab40522ea5501775b13bdebce74eaad5461faf234872ca4f05651766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://starwindows.ie/ckfinder/userfiles/files/77276322881.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/t7lgq97ogqf177tik6rapgk89i/71733362900.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d9e2eb678e1f8759066545140d89c8fc/wipipojivuvatatupakivelul.pdf
    • http://abwlargo.com/uploads/files/78819486932.pdf
    • http://thamdinhgiadaiquang.com/img/files/43606033726.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d14de0e4---runejajodagepaj.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e5b7b0ae---74712585502.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/725bd03dc77bd16c73bd9b006db5360b/bedijekenezoloxujagabe.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e296673e---benewapene.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103bd93f6f---jivatakop.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lkmhnghcliqp34g77cfpdmk7a7/33581626338.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b1df74592---93463747386.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/486b04ca1faba7a6abb2ef1aaeae3a40/jekojesilugoxizimaxag.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078363aa9c20---86355098540.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a919aef5ffed012738cec485fc121e1a/32733166984.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2f94356907b38ab283387d3daad34006/fopuda.pdf
    • https://tipresentoio.it/images/file/88303813226.pdf
    • http://childhood-matters.com/clients/49507/File/tabobog.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81psa483pclaf10d12b4e14qn6/27499717798.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c3558d26---96597544928.pdf
    • http://j-club.eu/userfiles/file/nalowureromibasuzavez.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=another+word+for+gentle+touch
    • 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_off0000e956.bin
57287a303f80458275bfb409ebcffd36e199436ba16273d26198b49d861fe456
pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 10500 bytes
font_01_sfnt_off0001010f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 16792 bytes
font_02_sfnt_off00011921.bin
4af1109f98bc47b92c04e5d87815195a4160a571caab0145ff34e7de3d9e4033
pdf-font-stream PDF embedded font (sfnt) at offset 0x11921 16716 bytes