Malicious PDF — malware analysis report

Static analysis result for SHA-256 2447f426fdf35bae…

MALICIOUS

PDF

92.4 KB Created: 2021-08-14 21:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da4f16677bea630f902492e2b0bde23d SHA-1: 4860b7923b7769488abf30b01616184706b019bd SHA-256: 2447f426fdf35bae509e5df6a11d59a0accf128c57ab5c1daaa57d3aaa896662
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://louvre.lv/res/wysiwyg/file/65068969943.pdf
    • http://kamerton.nl/clientfiles/96707115687.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/89749289013.pdf
    • http://goldia.cz/data/file/3181683538.pdf
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/najorujedufezirusega.pdf
    • http://catgarner.com/clients/873270/File/26780494222.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa4ddc435---zudogiferaforakodu.pdf
    • http://voszveszprem.hu/_user/file/12600576543.pdf
    • https://living-stone.lu/userfiles/files/dovejugavilizadepejorim.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/88844158b6c8150396670f8a7fb56588/xedanijurofetemematixek.pdf
    • http://sqx.cc/upImgFile/file/20210514091108.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3730f848d7---11816998124.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b72aaa4bb88---nobibogolikegalifoba.pdf
    • http://heninrealty.com/userfiles/files/pagoferujafivajo.pdf
    • http://mai-colle.jp/userfiles/file/bunuzabafirod.pdf
    • http://tele-video.ru/upload/files/78595948250.pdf
    • http://sakem.org/userfiles/files/3779138240.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4dc4bcc478d90466182dee863a0208ce/kavanufodesowev.pdf
    • https://aterhesseg.com/up_image/file/bivezima.pdf
    • http://medicalproduct.hu/images/files/napixixuzukezow.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/dde40cf6b4f2122a1f8248b2eaaa8469/megodijebaw.pdf
    • http://studionegro.net/userfiles/files/gumawapidisuvuvigesunikon.pdf
    • http://www.bash.cl/media/file/77048938810.pdf
    • http://evpltravel.com/xv_image/file/virojugu.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/c02037fd95997abefbf79d27153e269f/70545961159.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bf622a67---56547806222.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+reset+whirlpool+cabrio+top+load+washer
    • 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_off000106c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
font_01_sfnt_off00011ed7.bin
cac1666a3ba73d323cee79781c51b480f4ec75f26605e9bf0c9f6b64710c70be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 16984 bytes
font_02_sfnt_off00014af0.bin
44ad62cc1a63ffa620efa6bcf40c27254d8da4b3d3d0ebcaae9f17362a231af3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF0 10724 bytes