Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b7eb44dcf6e234…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 12:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3388fbadc7f7010f92cced0ab122a0e3 SHA-1: 9d2debd07232f2697a15b5e672d157c354cc9b2a SHA-256: 50b7eb44dcf6e234c79f0c8fd99d2bf7dfa7af763adf7cc1aac6075c483ea70b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be hosted on compromised CMS uploads or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. The presence of multiple external URIs and the nature of the hosting suggest an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://myblindz.com/fck_user_files/file/13462350543.pdf In PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b976430dac---mukaguraxuvipo.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/xamitizesuxikisaluduf.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/47418829805.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/48829756653.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9587bf07---rovekalosumufovetewani.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/3112664033.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccae3b8fb8---21900903001.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sl9cord6inqh4kpbserqijgmrc/lirotavekegopolavitagape.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gosoxifijo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/85508659710.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a270c32bf05---tidinurexiwabumofalaw.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/monapudi.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/popuzamamo.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/favaravezu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7680b5a36d---jokowevoti.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84aa13dd7---20806454659.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b18953786c195b74fed8168b45ba32a0/zopamotiwawetadowodepimad.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/zidinugirezukasebivapes.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071e26e9a859---1450922468.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a88d38ad---76572500581.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/016c850deee3539c4228d012f84a55e5/juromubob.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/voguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ryan+phillippe+and+50+cent+moviePDF 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 10992 bytes
SHA-256: 8f5f394af261b2512afb5b1afe5a1731bc633ffcdefddeb443e5dcf66994111d
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 18900 bytes
SHA-256: 942a30dd62b614798582016e972adca0e6a0481612362010ffe86a77cf26120b

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