Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f7123918430b7b…

MALICIOUS

PDF

88.2 KB Created: 2021-08-12 11:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b77a1d61fb025fa17366cd1337ff50d SHA-1: 1ed82bc8030e83be14a2dfee0a810989dd1f279a SHA-256: 50f7123918430b7b063bf91f4d408bde03a5d0ecd653d6671c4203f96ed8544e
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for SEO manipulation or to host further malicious content. The presence of numerous PDF links and the use of compromised CMS upload storage suggest a coordinated effort to distribute malicious files or redirect traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://dagmare.de/userfiles/file/36455560460.pdf In PDF document text
    • http://hsiwww.com/image/files/20210725_104343.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/junefenanog.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/wimozelofilodobixuku.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/69528cd6dc880a3dde8c1df38603c0ea/zikabosezadebokikun.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/569980a6df3facfce811d176d7d430a6/rakuragisemotejiz.pdfIn PDF document text
    • http://amdind.com/userfiles/file/3591437016.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e8115c10---92994332507.pdfIn PDF document text
    • http://sonet.vn/uploads/images/files/vobivomakenuvekavipibada.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/nebilodibabazupare.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/52214967097.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67246cadc3---41652320796.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/fabizelilufuwo.pdfIn PDF document text
    • http://bjallstar.com/upload/file/mixediruweroxuwujewotibi.pdfIn PDF document text
    • http://axwelindia.com/uploads/42526560613.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/20053149964.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3c59d582ffa985afbc50443babe0b1fc/porelal.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mj6p6rkke14ubjfnem0pi6etj3/74802485374.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/64887308494.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/vepamoxefodilosidadafeju.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dac5c524101---74951290619.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996ef9dfb68---fovewezisizetopuga.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/78776559085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ignou+m.com+admission+july+2019PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ce12527cd2c57f50fe9a2be690d07e3c/mimodijatur.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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 11204 bytes
SHA-256: 9ba61ed9b6e304776b8390067509437c3b12332e43bdba0bade539ccd5e095c6
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 18604 bytes
SHA-256: 7183ea1b6e57b4e0390009f9e0b00d3079fd5145a2536237b0f70392e3970eba

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