Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f160b4ac18bfa7e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 03:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98e1e1baf5a3a0d4b44aa9ee461e3fb0 SHA-1: aa694061e7eb0b15094d2375bf7f655381238b3f SHA-256: 9f160b4ac18bfa7e14355e5462d82df52aee7eca1a0313ae9e28b475858f9953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely for phishing or malware distribution. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=lcpdfr+startet+nicht', are key indicators of this malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=lcpdfr+startet+nicht PDF link annotation
    • http://taihegas.com/filespath/files/20210819161126.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef3d3d1f7---34341256429.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9b068bda210a8762ce606ffdf123d629/kineje.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v48in0umdfodj87jm80fl4dt6/tukatibeveposuropabe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe9970540d---kawoguwirugijariwiruwu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/94209037432.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f7668104d24caf6925837ede876271ae/renogale.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/53997794564.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/mafidupaf.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc72284f94---72661057731.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/31838174959.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/48311376476.pdfIn PDF document text
    • https://iword.de/userfiles/file/86563569571.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9f9079fd9cb269b8047325acc3992eeb/95821785389.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/13181763404.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nugagalaxuzalanato.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/45650642163.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01f686cd5---17892707256.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/rinedanotifufimovexiveb.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/39802215498.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/nejufezotijipuziri.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/51303609309.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_off0000be43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 10508 bytes
SHA-256: 6288695ed11344dc4defa469e804f19488a4a664d2016fd17eabea482d31830a
font_01_sfnt_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 17104 bytes
SHA-256: 3acab09c5a53054c40baebb27b0250fb598c1192b7413b94a811023bcbccd77c

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