Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6436677a67d22b…

MALICIOUS

PDF

67.9 KB Created: 2021-09-19 06:41:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 0ec626a67760124ce5a78de640b5f575 SHA-1: fdf4e706e254336db740b372ff8ba0b377e2e33c SHA-256: 2b6436677a67d22b82d55984d9012d26ad0c5153bf9d76f7becaa4e1a9de455b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, indicating an attempt to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=usb+tethering+smart+tv PDF link annotation
    • https://crcnueva.naturasoftware.com/uploads/images/files/piwebaxigesuligipaja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc7d25faa---93299887492.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/sugedunekenuv.pdfIn PDF document text
    • https://yasacompany.com/upload/files/gekosewivujotebepu.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/rogejozatiwanivim.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409afb1575f---85972134258.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/63597178213.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/17946191737.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b95e0088d---87079659521.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/28348877247.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/lores.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/doxazosexi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387fccbc028---mofasuvad.pdfIn PDF document text
    • http://jinyezi.cn/upload/40273916593.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a407883f---lutavogipilejasax.pdfIn PDF document text
    • https://clinicscrm.com/img/files/xexiloziditexivazalatoxe.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/91855976172.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/kajogevibowaf.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/ropatuvubotinafozetanuri.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/kutovivukunedikomasadi.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/fokenevoguredamikokagaj.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/44188711505.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE52 10600 bytes
SHA-256: 406b8ca8ea05915839bb5bf2e992a2d1e0dfd9fb3ce0435d917786b86b1e20ab
font_01_sfnt_off0000c667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC667 14628 bytes
SHA-256: 2d8bb724638641deba820686679347387e13f5ee166dbab8394ae42c127d952f
font_02_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1