Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ffd6ef31e2b7b4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 02:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 277fe73a8c7252f43475f312efaf84ad SHA-1: 0f5aee2428fddf0247a7b031fb92c6a3725fcf40 SHA-256: 93ffd6ef31e2b7b4535786a90d3c7d446b54ab27142756b94d6209f500410bbc
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains, likely intended to lure users into phishing or downloading further malware. The presence of external URIs and links to compromised CMS uploads suggests a tactic of leveraging potentially untrusted infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://queure.ru/uplcv?utm_term=split+pdf+into+multiple+pages+c%23 PDF link annotation
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/l35opnmueatdepgp99itb870690snjac/vodofidujorisu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fd4af6b4---bolodagusumaloke.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/72991716630.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/31415604003.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/turupewir.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/983a9c66b2f555d3e1bf2f564abe4cb3/34079100512.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/82c4c2ed50e6be44aecdd9465ba17d51/32526452133.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210805044219.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd19736e56---mobisajonopen.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb501bacd0---bikexawerij.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/bezujuru.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/pipip.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/597b9a1a35e5a82a0031bffe0046049f/pomanegoveb.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8bf52ce5---tobela.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/degujujomivejudelug.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/38760376899.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b8cc96d4fe8f49370520029ea1a3183c/dijidenekibax.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/279c745c083483e9b186711930a72db2/53260037750.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/239c2248086d1d17fe94d20ac6db6594/95296371632.pdfIn PDF document text
    • https://subded.org/userfiles/file/36149907808.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/15156957873.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/31235646820.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/74600305548.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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 18040 bytes
SHA-256: 94cea5a3a5c4d394cd841430e96e9b75c62e385f84ff95f4d66dd71b0c78b3f6
font_02_sfnt_off00011644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11644 11040 bytes
SHA-256: df79134f17553ecf1cdfb70600b2483025308110fb2fd0606c764db154391faf

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