Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0ba4e8ee9d4356…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 20:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78238cf012a62437d8ad25bae481dce7 SHA-1: 79090fb08c52014e8bbdb40da00e4b3107b0e0f7 SHA-256: 0b0ba4e8ee9d4356e10bb8191eb08fdbea2f65853aabca63e92138e66484f7ef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. The heuristic firings suggest it functions as a link farm and a callback phishing lure, directing users to external URLs. Although no scripts were explicitly extracted, the PDF format and embedded URLs are commonly used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=russell+hobbs+buckingham+toaster+manual PDF link annotation
    • http://czerwoneiczarne.pl/files/file/71890992313.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1bb0d55c---tesawuwodoposozukofena.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/4823074500.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/jakidu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/simowet.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/67437616412.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/fewiwimagelagizajemata.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217f3510a95---jupajakegi.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/tidufalogapeb.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jinisove.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/54744752995.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdd7b5772---tiluwesij.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tezegupom.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wanoguxizijonixituvakuri.pdfIn PDF document text
    • http://coolingrealestate.com/your-home-cleaner/FCKuploads/file/52287315693.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770aa2b355e---97402962897.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af14c5e1c---31883038043.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/42346199366.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210702_014223.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/zoweva.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/4947508316.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/kigovuz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101071f96ea2---lezanozejepunalevosad.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-7/20210607144804540841.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_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 11052 bytes
SHA-256: 7e8b742900825f0c038141fdf1d4c18a0f8c74f6503a88bfa0b9b29393912569
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 19980 bytes
SHA-256: e9b38df95fb50aec9c64deb8b74c187880fcf0cbc60cb27f7eb5dcc0bb4ba577

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