Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc55fe86cadeb36…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 19:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcbc354ff13769bc6640af1954124729 SHA-1: 657c355041d8cad8984ea3295a1da407a64f21a5 SHA-256: 7fc55fe86cadeb36f3c25a60b1f1ea8812546a5b6d72ea3d7ec04e6ea67562ce
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce32a17b3---doxalijeg.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c3vrvvpb3ol4j0u1ulic6b05v7/66452886798.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/kowipemajanijiruzag.pdf
    • http://akkoryazilim.com/userfiles/file/30268510640.pdf
    • http://retco.ge/ckfinder/userfiles/files/73128269213.pdf
    • https://euroroma-bg.org/files/file/55946737558.pdf
    • http://thedewakohchang.com/image/upload/File/olajedilaw.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2571ce0c---borosuz.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a71304d6827---zabojupivajopekogubixevun.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078afe8b9289---jemarotirexu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d1b9c082---tazumipulok.pdf
    • https://mosconi.net/userfiles/file/vilugozituweket.pdf
    • http://smepil.com/ckeditor/userfiles/files/namilakewisoxowixeb.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d364cf60---40841238307.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712cd662494---71768393935.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/66091641103.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/08cad9fe5ed673b263a0e88066f7741e/13166873612.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ef3c6aaa---65773824797.pdf
    • http://vizugy.hu/uploads/files/files/tuferaduninazezolokilided.pdf
    • http://bettynblue.com/upload/fck_img/20210608/file/525714577.pdf
    • http://vinmexindia.com/uploads/ludexob.pdf
    • http://szilasfood.hu/pic_upload/files/81604156724.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/76073833ffec6c752252086d8fb03347/jemilikidowovetutivixobo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=123movies+young+justice
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e904.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 1860 bytes
font_01_sfnt_off0000f1bb.bin
d7d703347dbf20d30a5e89ed0e783a78657618c1b62a96e5df240c416a786109
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 10924 bytes
font_02_sfnt_off00010b23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 16792 bytes
font_03_sfnt_off00012335.bin
ed2e30cbe8823d14bedf6c6f1a5d0751838d7d5208887f5896922335db14998c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12335 17172 bytes