Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bd06fd9ef185b4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 20:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 311385e811900d2093f0cdb1d441c22e SHA-1: cf3fdc9c335cf900832a802c1eeb9cc2e9b87806 SHA-256: 50bd06fd9ef185b42155e067ddcca202c3023f83f998a9b8d51607128d12f40b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The primary purpose seems to be to host or redirect to malicious content, likely phishing or malware, disguised within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607788e224c9c---xurizimanobato.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f986229eb2---zufudomesituwogus.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/66019927886.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/pekijoposos.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9c8955f1---29772710252.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/34679014956.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/52904371220.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7cd74779b602ca4af281826fe2d6388f/67870423156.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291cc49560---53081451770.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/795b0e98a97dced0154afea3cfc17166/nenobevitukaxubowugibiz.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/xasit.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/518cfdfcc313f76793b9954a700999a4/18081049088.pdfIn PDF document text
    • http://babyschultz.com/clients/72285/File/polugadonozuderoluxozojun.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161172e04ed92c---96773423215.pdfIn PDF document text
    • http://warungmimpishio.com/contents/files/79725984102.pdfIn PDF document text
    • https://digireg.ru/upload/wujumarafofasiketobidiki.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/lotunesewenaxu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/21e0df532f3b314c07f54116364b911c/barososamigit.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/10leqfib3rjcid5nutm6hdimfg/wilegimugawamuxesanag.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95423529065.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092668bc39d3---bulijulelobigikafudewobu.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/67711079398.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/musoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=drawing+atelier+the+figure+pdfPDF 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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 10676 bytes
SHA-256: 220cfd1a6e4be03226b93f410961c2ff9fd5c3326c83f1b0227ecb906ea40c61
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 17872 bytes
SHA-256: a1447946552f2a570a19bea88b8e691e91e1e36f4450b002d6ea5ecc87871582
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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