Malicious PDF — malware analysis report

Static analysis result for SHA-256 1381579bc4163ee1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 19:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31cb341249b0fe1ca28d9c4dae9c0757 SHA-1: b714522293ac722c0c3033e252dbe345f3d3872b SHA-256: 1381579bc4163ee195e6c1b71df23fc48a1121eba4da02fffd9b01add745f82c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, primarily serve to redirect users, with the primary IOCs being the suspicious PDF URLs themselves.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://eurouniversal.eu/ckfinder/userfiles/files/lipavarunogewirote.pdf In PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20217252342266876.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mimerelumujoku.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b556837049163a4cd81fa0c25e107da9/24656557451.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087af5bb7d35---gosutugofaxulogikiluk.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e3b572a1---talivifalufuzuw.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c61f5fa92c8---tivuzaj.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3c643320---50714551948.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/14960277914.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vosugogebe.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/43906356326.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feabc4e87d---vuneluzerov.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/hojnqkbak1l44anqiqviltu631/jasubaxenesofelep.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20ba8edce---vezajuxurijivalujewakaj.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607209419d184---15464662845.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/98212041819.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/juwusosibojimijojinule.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/vokugufagiki.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/26243892160.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/72212660623.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d496186db---43582680537.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/74903849052.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/29550977726.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/8p4cr6knqtk3f8nh94t8nno54q/68224602563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=honda+civic+2018+manual+philippinesPDF 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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 16520 bytes
SHA-256: 9933a55bd6689cf21ea1a3442f9b4fc39303b8f78ec8ec0b99533d5de8e3cd70
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 11240 bytes
SHA-256: dcbd0fc9d075e6c9cd66504b3f43d4234a600436c2b6f8d6319b48889dcdb401
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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