Malicious PDF — malware analysis report

Static analysis result for SHA-256 0588df38137d9c43…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 01:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eff7512df422981d1f304351cad9053f SHA-1: 40f01beac4ca568dbe19386d572051aaab12e508 SHA-256: 0588df38137d9c4328c93b9d96823a1ecd8066cea865dbd659ae9746ef5d0cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs and the heuristic firings point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pixomot.ru/uplcv?utm_term=signs+of+anxiety+in+toddlers
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/229fe1274c1f4fd5d6308c5b3df840b4/81213951822.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/998a0f95f839168dbac15840f7f629db/vubekadesozidet.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6bfd49b4f42d0c0383c12813151d1e75/83909455844.pdf
    • https://xistenze.com/files/files/30289112992.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2ec0ff767203cc9d7de14bcfaf254f1d/bomipulidononixeba.pdf
    • https://dcmheavyequipment.com/admin/images/file/ririxel.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/163aef514016e434e0cc10e8cd209675/bonezavibab.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0446aecbb---guneselasopir.pdf
    • https://hunde-katzen.at/soubory/38670957867.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39969a5d63---811123196.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f772add7---fovebamidiges.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c16de478---51324838069.pdf
    • http://cachnhietcacham.vn/Images_upload/files/mejufu.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff13303d8---lajegabowuvedafof.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/64b9c440bbfde0b279bff4a9379d4845/47363494434.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210616_011CE8E2CB3873A1.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2c4c071731fc506ca07fd30695fbc899/3970585457.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836060a93eb---6854010437.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c532a060---32951851889.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607afa1f3b324---xiwosupijaxepuvokopa.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a10c1ec04---99236283843.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/hk7vekc88ju733q51n5nkfn1qf/17422724987.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf7e4a816---4603793447.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/954af0235285f4daf8dd70c52fd79c78/mutilivagakafupu.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2966b9cf05a106ef84455b9269292a7c/31685648090.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7vhjejngo23vjc36q33fh2oak2/39361625479.pdf
    • https://emauto.lv/index/images/up/file/ginajebimidijexe.pdf
    • 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_off0000f380.bin
6245a9b3377fffd0c7aed0501fc7fc81680b516af6a83ae7c5774980d86413a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16840 bytes
font_01_sfnt_off00011ec6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
font_02_sfnt_off000136dd.bin
ec0a5edf18c140e4d74c0b1adbbdbfe3fa212e560c9a53f1151363473c3d3f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 10820 bytes