Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d72fdd2a39cc14…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 18:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ead700f4557260b6af3982341fce0f7e SHA-1: 47cb936b9672a89b1b0621c75851d08c79c3f90f SHA-256: a6d72fdd2a39cc14e068df2785370337b51358d8e3f77b7f812ab366f934550f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/1ef49c1f01f5b8ae25fb636118eff1ec/naradiwinedope.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd5dae460---9674850468.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/82e5021be5a66692a53c4547b85d141e/91489794176.pdf
    • http://2990592.ru/ckfinder/userfiles/files/gukujumavolutujabot.pdf
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/tetunugixomesopob.pdf
    • http://samocvet.org/foto/ck/files/67034459864.pdf
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/bokupemetarapiwebezipuj.pdf
    • https://okazionche.com/files/bujaroxonopuni.pdf
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/65044688718.pdf
    • http://esejsc.com/upload/files/relebufebapekaxukegiluve.pdf
    • http://www.veslovani-vsb.cz/soubory/file/871566077.pdf
    • http://seibyou-koujien.com/files/files/9008152515.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/55082032466.pdf
    • http://geometramaurotozzi.it/userfiles/files/zefuv.pdf
    • https://netiko.ge/img/Data/file/suboxosavip.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e8b637d0c---62323431591.pdf
    • http://paillasse.hu/userfiles/file/72885616435.pdf
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/pebatazuzobufimanezepepip.pdf
    • http://garageanything.com/js/upload/files/rabodenudeb.pdf
    • https://matricula.arendic.cl/files/64023394399.pdf
    • http://tks-forever.com/upload/2021/09/07/file/82058608705.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ppsspp+games+ristechy
    • 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_off0000abd2.bin
06afad9525ba699f99132c990653acab6c467cbd06fbdd62b058ed1bc30462f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xABD2 10664 bytes
font_01_sfnt_off0000c456.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 16792 bytes
font_02_sfnt_off0000dc68.bin
1351fa5c014c59510a287c3f9637228c7c25bd4e0c30aed46cfa8ad2c4145c02
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 14616 bytes