Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e91f500e726bd89…

MALICIOUS

PDF

110.8 KB Created: 2021-07-13 22:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 595953fd42dfe79ec99c39367cc72abe SHA-1: b50c4392f5bbf7bef922cb753064bfe1a49f5d92 SHA-256: 2e91f500e726bd8916f2b991a797ee4e9736cb156acabd5e2b563b644f961171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised websites and potentially malicious content, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=english+comprehension+passages+with+questions+and+answers+for+grade+6 PDF link annotation
    • http://ever-pioneer.com/upload/files/80075575871.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/23898459642.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/1ef831468854c6a5c10df664c47b2060/64876006922.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/em8l375p45c70kpp8k6dh3ptjr/86942047122.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608606fca32dd---dawipexaditutut.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/63064521716.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gelijeda.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b4404438c69d8852a5040a4bf659945d/famijaxivelibimunozaj.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/pozadejexavegixi.pdfIn PDF document text
    • http://esistore.de/userfiles/file/relunubitukeramajutogog.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/dexupimenexapoxereto.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/92vf3u52bhbu1ooe6noqcenb1s/vokisuraworevalu.pdfIn PDF document text
    • http://mopron.ru/upload/files/wimubudo.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051708343619.pdfIn PDF document text
    • http://novichiha.ru/pic/file/51193247103.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/gaxowikogisibuvudugedevu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pccvbauc98sn1fmi3jbe5tjd7g/tebozujatopevav.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eefb19c0480f93411ac87de8a1c82ca7/44741603744.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/41396057400.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///61198430875.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/pexakosuluzizegijobasemu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d9902539562---33867005820.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/26307495571.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_off00014eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAF 11548 bytes
SHA-256: 1e061c15bc9260fed9b7202e1b17781a849b7effdcf3315865e7bd4f734e7ead
font_01_sfnt_off00016963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16963 17092 bytes
SHA-256: 75ec70183b4fd655ee67e1de6a4e37b4a54c1abeae9fe9860173c683c6b013f2
font_02_sfnt_off00019554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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