Malicious PDF — malware analysis report

Static analysis result for SHA-256 907fc029994c4466…

MALICIOUS

PDF

78.5 KB Created: 2021-08-07 13:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3df1e409aaa27c926e47993988e5c65b SHA-1: 25ea6f5f8d4dc38c3cdbb0a48cac86d0edd7b97f SHA-256: 907fc029994c4466a1f03a67f7ed0da8ccbdcc995b8da1fbc9759af52a518dbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to various domains, many of which are likely compromised or disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

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://sts-cct.com/app/webroot/userfiles/files/toxorulabumamenenasovu.pdf In PDF document text
    • http://kiuanai.com/userfiles/file/91093973686.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/75963142202.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/11934060537.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/86259680869.pdfIn PDF document text
    • http://mfahk.com/upload/files/13865203173.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/mapifagelib.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/lumugiduwaximizivesa.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/26091123961.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b474e3064dbe1a5bc8e473ccc8c0bb43/31914798671.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/vonupomuwotovegeziguseme.pdfIn PDF document text
    • http://cochu.net/resimler/files/30199623538.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/raziturowa.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/fifamoluwofetujigatifu.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/32275046621.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lg76k5dht4ood38enti7n26nq9/nivasaxosuvirojop.pdfIn PDF document text
    • https://iwistw.com/upload/files/wenuzenedasowelobas.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/46099fca70abd93da48c5765ef55fe99/rojorujibevezevotufuviw.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1699c4ca7e417dc0925d102649d31f9a/tozuzakixetibazimitigewow.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xewulumaxabuwuxi.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mnu76llopkbfk00mjtoba8i6e5/33788275485.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3ac723c56---30585351399.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf626705f6---52885032216.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/61464573627.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d020b6bd98391d4c9b3b7cf651bcf222/32906186489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=el+proceso+de+investigaci%C3%B3n+social+cualitativo+pdfPDF 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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 16196 bytes
SHA-256: daced4047dc1ac7acc7b6031bc4e5bc26f9d520edc1d17bacf873a008e0d9f9b
font_01_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 11084 bytes
SHA-256: 32e9cb5ff641d3fe9915f9aa86280f61582b034980f7a8ab6e13c14de262bc02
font_02_sfnt_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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