Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e6174bd21ecf16…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 02:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4aa548978c96a6825710c8ca67b18132 SHA-1: f7b15fb83978f06a23b6a99d67f1b75819d76c08 SHA-256: 52e6174bd21ecf16c67f57d78a311a448e5fd98642bad885ae49ae1269a26a68
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document's structure indicates it is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick the user into calling a phone number, likely for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://interference.ajoda.eu/userfiles/files/goveramuxogafinavoz.pdf In PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/bixukiwikevanadimakasu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/82d301a72e1247d8a2ab08626fe2bdfa/jizadigoropibolezemoxo.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/23364415466.pdfIn PDF document text
    • http://ruresept.ru/files/file/49385520.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/kitivosofoga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474b03c0d44---52215170377.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/81094184901.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/14391931604.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/87212312838.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/66395478424.pdfIn PDF document text
    • https://people11people.gr/uploads/File/figowu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c4b49a64cd96a44a7aeceb4493d3adbb/52496316785.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kuxazivedekoxovifeb.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/25690524333.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/33831949746.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/14946507570.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/76877857243.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/82434666413.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/4812426771.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/49591800213.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/45920047043.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/mutafasakixo.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/bogot.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wanopazadudopavozeza.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/90270390798.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20211001215227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=first+ionization+enthalpy+of+nitrogen+is+greater+than+oxygenPDF 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_off0000b328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 15520 bytes
SHA-256: 4de885fc883622194e6144a6aaecb5ea53208da762c1a86b9a136491e8be5eaa
font_01_sfnt_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10888 bytes
SHA-256: 4aa4491854919c411bccd7172fe698ac2f25486fec7210268ceca7b5b8f2b81a

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