Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64500375207c530…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 02:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b771999e08d8ef62f55997d8a89e53f SHA-1: 793105ce17dc133e20eabd87fd3dc56ecb24b359 SHA-256: a64500375207c530ae4d7b05fca757fd78c1f613a36c4a30e55abebff50afdb0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5f21c7da07e9946178eb978d90b99db8/35357551316.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/daxufu.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/efjvipkkv2rubotnktro9br096/firipufo.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/77d0a2167b3416863808c6deaa388368/gisilirametixudetada.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/kexakijim.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d49a08be431ce802ebba198fab1405d1/62664636137.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/s551lit7frn2sfb4o3vftupt23/9871612688.pdf
    • http://tuzvedo.hu/elemek/file/xujogademigisoleji.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/knem2lvl4o203ulqv99qh1vove/536987956.pdf
    • https://cornerstonelaw.eu/userfiles//file/14365628170.pdf
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/22442641167.pdf
    • http://gyobel.itpublic/file/69257494839.pdf
    • https://loctra.net/userfiles/file/85062620949.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a5379343d---sizofikizabopedati.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/76319bdb489c1dcffb4f382c0787b6cf/24332501368.pdf
    • http://studioguatta.it/userfiles/files/2589274359.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/91lls5c0ls5627pjtilillsebf/8100840716.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15832193284.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcc56edcb---borimobuxeverimeb.pdf
    • http://machinegroup.ru/img/outer/files/mewanawuduvifubipub.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/oeqrejq8d3iv42h78tu5necnm6/56366006794.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c3e4297ea115911d070c3443de469bcd/tagigesataritun.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/143def3eb18a30111ba4a5c86fc894db/xumegixi.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467c6bd063---34037592267.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tool+band+quotes
    • 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_off0000efcb.bin
cccc00934636ebe6a46827f048298b491065b8bd1d186bba27e7d20150f26398
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCB 10400 bytes
font_01_sfnt_off00010749.bin
e9db49ef6d483f8c5bfe38525ad131ae48795799cba4397449e810c9487dc860
pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 17216 bytes
font_02_sfnt_off0001341d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 16792 bytes