Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b61f950fe5d6ff2…

MALICIOUS

PDF

91.8 KB Created: 2021-07-24 04:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c2fa36db08b4fa584f09fea35320dc8 SHA-1: 2b55e5c8bf2f0087857f52de7badfb5b56ebb27b SHA-256: 1b61f950fe5d6ff2eb1fd3749dabacbdfb81c7b8eb93dd1afbd2d6f86f5870d7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt designed to trick the user into calling a fraudulent support number. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://maraulsan.com/ckfinder/userfiles/files/vigujeziwetaluw.pdf In PDF document text
    • http://www.toptehnik.si/images/sakixipewodozan.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50374e4cd---siburoxedakowaridu.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/surojunodetetalofori.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/47248844045.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d852cda91---17327290214.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/sevugibi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/fomijovofuvudo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/ninixinogi.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/tetiwipibu.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kenuwove.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d52e804bfce6fc29d6a6f85442c4b3c9/vobofad.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/bde7fb98a24908098aa3f0fe0104e309/sonipilomafam.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/bajerovipogurugus.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/26751379231.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/nekatiragizivutokufiban.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cd13633e3fb50a5f973d9ea7111b7a6a/82827987025.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/47320294947.pdfIn PDF document text
    • http://meta-min.com/files/44339196446.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c7f64a619---26217791129.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/2409027053.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/lonixima.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f019b95bcf---vejememoriditiv.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608176af262a6---xajexekezakuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+much+are+giza+dream+sheets+from+my+pillowPDF 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_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 17568 bytes
SHA-256: 8d91581169e5635467f30e9e29a85bc335279dc301f6180895332249e04e62f9
font_01_sfnt_off00012d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 11316 bytes
SHA-256: 4e19cfe777e478c38a25cc872325a6d9754c4c56eae0e96e1140856a5b21db07

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