Malicious PDF — malware analysis report

Static analysis result for SHA-256 4937af7ab72d9cbe…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 06:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e393c063ada74dd383d183e24cbc9747 SHA-1: b3743eed6125cf6bf6831a29ac8d863a3d82974e SHA-256: 4937af7ab72d9cbe59c3526ff0e855b953aa234a66b24ede5723cb043b0f6809
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external domains, many of which appear to be part of a link farm. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number in a context suggesting a scam or tech-support pretext. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://proallprint.com/userfiles/files/ruxijebokagapenepoxavebi.pdf In PDF document text
    • https://bloc-immo.com/images/wivewazefuwibuzeterumura.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/japelopesegumodunetu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/84224803849.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/xizidujinemusikorid.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/79590320915.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/padixipi.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/roxuxowazubonenu.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/razixo.pdfIn PDF document text
    • http://mastervin.ru/files/file/xomeze.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bidukememu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f921659b---roxopozetetabenipovopefab.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/xafibowuxajovanuka.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368b772d1b1---dopojisonezowopexi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33cef363e---91724280925.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/xegigorararef.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/gepebavegukozikosogiw.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/927437588.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/21112817726.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/13857664841.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631168502.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/45481231295.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630639232_1.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e8aecc15---45031284172.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/gadikoj.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sosefagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141181916780---30249358382.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sozeserivugavulefopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=intel+android+virtual+com+portPDF 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_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 18720 bytes
SHA-256: 809ee15d9069db5774fb5a6fdf2037fc93f8f4cfb5a577c03474e6ff0ef6d430
font_02_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 10624 bytes
SHA-256: 71933d1f3bf2cf18893c4cd61f097a40613054e293a47e1749af1eda1415e72f

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