Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13260bd8adadbe8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 20:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d397edd9363f04802622dd61c2d525f3 SHA-1: 51d798f8a0a2e726cd2e31fcd9f88e9f87202c7c SHA-256: e13260bd8adadbe84d9b4ce864f7bfae5d8a0d29ed7ce9693dbd93ed1285d336
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ets-sptk.ru/pic/file/20712952249.pdf In PDF document text
    • http://fapannimario.it/userfiles/files/18411159819.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/jewakuponofaje.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161379725f41ae---wuvegarabajit.pdfIn PDF document text
    • https://vendax.ro/files/file/jazexilotalesagugo.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/89467331691.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/29635005629.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/28858512064.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/16314603564.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/42577559575.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/nazug.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/49980824126.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/22087521562.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/18142584460.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xububaxomugar.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/85678814164.pdfIn PDF document text
    • https://alariel.be/userfiles/file/7530409771.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/80834287866.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/1654096959cef07d6cb889f1cc3f1491/89832195309.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d759efee---97021940858.pdfIn PDF document text
    • http://usateatop.com/_upload/files/85878461513.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/mizoxafim.pdfIn PDF document text
    • http://juentai.com/userfiles/files/41564955846.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/32769334752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=top+5+keyboard+for+androidPDF link annotation
    • 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_off0000cca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 10624 bytes
SHA-256: b88a747972aacfb1d10a38ac109fbc733eb051de74d99666e7eb208f720e7154
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 17336 bytes
SHA-256: 3c9944691c099da021ed34689475dd6d0a443868bd3ddbdd35d20e87eba7fecb
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1