Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b4d4bd858432f5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 09:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e788a1cdd5b232f77db50278ec8ce211 SHA-1: f087572d9cf73bc68025406edfe4f8cf8ddd792c SHA-256: 46b4d4bd858432f5d33ff323679a13e58345a4c33d0e854821e0b46b31fed24c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The embedded URLs point to potentially compromised domains, increasing the risk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a702caa687288f06549a5029f96d786d/33969191115.pdf In PDF document text
    • http://ladyvenus.it/userfiles/files/90391838461.pdfIn PDF document text
    • http://bougerpourstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/87053072903.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/gesimababixobazule.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/44aoalbbrdb4n31r8otlgrp2n0/ridijonowaxogawivimamelod.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a06dc511---68439952545.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/55932313957.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa346329d2---21963858815.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/58613991682.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/tidosuzavelavinawegida.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47c701503---goberu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bb7e287a6531dc09627ac5fd91e105cc/pewujefukin.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/vikibovanivefekilox.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tiridoletenalamuvovop.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/pewawiwupidelumiwibipu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5af7399f---lilixirisafanujugo.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/292249099531.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23320112c9---wugoditoxomiwibogopopor.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/50505583225.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/38f4554d133bb15537a288bcf1bd3d92/13491823180.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210531/file/87093448267.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b078d88d8---jinibovosuw.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d2f8b25d0d3e6e824814bbaf6451953c/74480068424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=swtor+sith+trooper+armorPDF 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_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 17704 bytes
SHA-256: 29588c44620c03f2d28f13cdae553b5e5aa91df6eeb2058859cb68043509b532
font_01_sfnt_off00011e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 10528 bytes
SHA-256: e19b03ed0e80ecad435ef36ac951ccc536462a33d763d7b5bdab038fb5d9616f

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