Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cfbe7f059b92f7…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 12:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b17ed1404be1e78cc7c2261cfbf63352 SHA-1: 6d437aad9c49db1990d0a39ea0b2d9d5b27173ed SHA-256: 98cfbe7f059b92f7e0c6867e944981b1efd35b90bb489ceab68a31e4f0e17eea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. This suggests the PDF is used to distribute or redirect to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wrd13.com/force/file/dukosuzerutudamimokuvune.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160887f86f1cf8---pelulowopivusubixija.pdf
    • http://otohyundaidanang.com/uploads/image/files/zejofonagajubi.pdf
    • http://asiavent.com/UserFiles/file///27284938075.pdf
    • http://abwrosedale.com/uploads/files/jiritonebin.pdf
    • http://canhtoanland.com/upload/files/fekuxabux.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/rimelemuxew.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3be376d8---goramo.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae459bdccf---kuwobokaxozegeluxux.pdf
    • http://energosol.pl/images_cms/file/55433435658.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/e01rlvqb80kmql1l6o5o9uf732/73397350808.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/28610758971.pdf
    • https://girisimhaber.com/uploads/file/54113821622.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/5438781606.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/rupekaganinetitivu.pdf
    • https://cytairtool.com/test/userfiles/file/20210716_2a2e5.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a0da91fb7cdaf8c9aea11e125cc2b1e7/fipofitunipajarane.pdf
    • https://amatnieks.lv/pictures/image/84033608228.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8890e251a6550deda9cadd6c7675b6e2/76865932888.pdf
    • http://pcwenhua.com/uploadimg/file/1626835872932855928.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabe1e6627---wogag.pdf
    • https://alatheir.com/atheirwsfiles/file/90244096625.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/18bihiqtsuluggmdq5qssn4g1s/dadadikizazubegolofa.pdf
    • https://itexpertdog.com/upload/files/juxuxuniwazusaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hadean+era+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcde.bin
1181902db9e4231b27ce4aa8fcdc08702256a3a0607ff2d45cdbf310bab775b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 18948 bytes
font_01_sfnt_off00012e67.bin
8c4ce4c0ac3e7fbdf2a3e5b5a09f53e598e3358a0385ffe0e70ced956c5a7d32
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 9960 bytes
font_02_sfnt_off00014465.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14465 16792 bytes