Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af2155657dbeffb…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 14:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4208fcc5b2eb020b90cf4314781323c5 SHA-1: ba72899f8e378626dea0dec0d2a19d722a8b95b2 SHA-256: 2af2155657dbeffb3fd466135683758ab9f67bfcaac33339c360665df7e01dbb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n5v1lb1ja6u9vfjcoo7rj09po3/67786779883.pdf, are likely intended to deliver further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bandenplaats.nl/cmsimages/file/lozewire.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d5c17978---43560686405.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/diwedugavulolas.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/nebizo.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gavozuxofarinagure.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/eva21lrbceg31n6f04aupt2oto/vatozusosodigiko.pdfIn PDF document text
    • https://proxus.nl/file/91552372492.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b083bda9e---modosipogirabebuz.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/suditir.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8d46bbc7669ef362567808c98a2ee3fb/4113014588.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/totazijuwevixovilomum.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/25bf10fc65b70899f039f8196d30d065/maketufazusati.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/30882bea43273efa141af3b905925532/fuginumotexomip.pdfIn PDF document text
    • http://altinay-law.com/images/file/xidit.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502165925406.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062519330380554.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mijelodabagosedir.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/tirabezesonamur.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n5v1lb1ja6u9vfjcoo7rj09po3/67786779883.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9978f7e98782abd39394c9f0ff0f809b/zijeratozegak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cardwell+hot+springsPDF 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_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 17600 bytes
SHA-256: c39841b227c9af052a181a37c6fddff9a0db34a1b73c30b498f03c8ea3c5ddc5
font_01_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 10788 bytes
SHA-256: 460b7167b044cd8fdbe06313df6d6ee4ad76d929762e17123e4a32d8168d6a49

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