Malicious PDF — malware analysis report

Static analysis result for SHA-256 51357b116ee17650…

MALICIOUS

PDF

88.7 KB Created: 2021-08-09 07:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e05c3c71223e9e260f45a9ccee8998dc SHA-1: 85f26ce2056a65e15a2ed5fc06d65f8d351f7f28 SHA-256: 51357b116ee17650868e0553fadc6789e5dc1f769123744c60dfd73104a105e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links and the overall detection pattern indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=4+personality+types+test+pdf PDF link annotation
    • https://appvid.eus/userfiles/files/80176327474.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/np2btjfh5ojmuadul4k0sb68q0/duxulixomamuruviwemada.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607428bd8c333---680912718.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/770a7bcc8836fcf3de7bba2d099db1a7/bonurefujupatawerus.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zokas.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/tubedal.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210721/file/fovelewi.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9a22cb83---35788495360.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numijetaj.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/7283802862.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/h97f3fqlhg5edb8v8ldetorlv5/rizadiloramuzezorunabotew.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c670bda23d---jezubosibarevewez.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e8cbf5345e1e5a47248c984c3e206812/35223447345.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/jubijajudadazinigotegop.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/72680508577.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c7448fe3---43578859740.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d22782757---24026237864.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gumufiwurakunaxa.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/dimuzogi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/vilowodiwakit.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/87913768003.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160977f1db1948---84303384364.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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 17008 bytes
SHA-256: 8845442ba2c97af44c4840340c7e6effeb96e04facef7a07c0902064b2d8bf7d
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 10588 bytes
SHA-256: a41af120d48465031d9cb5a51aaf5c1e9facbd61936442efea8098225f8318ff

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