Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fef6f4b2ffee99c…

MALICIOUS

PDF

83.3 KB Created: 2021-08-27 22:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5dbb2be942cf4a21be614c3d63783e0 SHA-1: bf9f7c5409d9d1c4893eff143f02cd4701745423 SHA-256: 3fef6f4b2ffee99c139f9520cfd7dddc36087f54457ab4105c10d1c6f75ae1e7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/70612b68164bd39f2c646616d47bc316/32383111632.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b7311ccd0866436ae7fabb439a8f5871/zumemesomevidetur.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xifafogokugirimeluji.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/20819514744.pdfIn PDF document text
    • http://yuha.be/_files/file/71354705908.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba55055597---gezevodagarizixobegose.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/ladakifixidujafelajor.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35e137f45a29f039831f79999ee93015/wipuwaperixinerom.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/89876570025.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kixetusotupuzor.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/miwekixaputosiradogama.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725531d9a0c---xinutijuzevobuxikalel.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/de2be0fc6dc893b959614884d70e38dd/74047222889.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/3836288695.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adabc84d0f9---25422962617.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/dccb9df336afe1b274e92e165942304c/17275728374.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/57388321833.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/60648158198.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/zuzinan.pdfIn PDF document text
    • http://coffee33.ru/archive/file/20525911020.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96f78a2da---73319644853.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/norezipukuritatuvuzezap.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1a5e5da9496b83f3e135e9f98e4baba8/96762696535.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/86099139233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=winterize+my+homePDF 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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 17424 bytes
SHA-256: 61c792b835ed5a71c83f9f06273780e53ba1c6746614c6e5bc7c82f8af9cc0a9
font_01_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 10164 bytes
SHA-256: dd5a77719454db8529af36cbb85cc6ca9d63276bb9b7638370fbb14acc32a6e6

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