Malicious PDF — malware analysis report

Static analysis result for SHA-256 b088dfb16845baa0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 07:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cffef8a2a099559ece6be86eacfab0d3 SHA-1: 282e6e7962ec94c6cc8fef929f541f1c3153d557 SHA-256: b088dfb16845baa0dd8389e271273bf99db387ca6c1b3d098275cd3bc1f52864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=lord+of+the+ring+movie+in+tamil+download PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a83ecb52a---45185660464.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a03d3908782---15883936461.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/34578287792.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/wuwekonur.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/87753589725.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/r80ourhjmcpgktbqtbdh3olub4/janoralubotegobejeveg.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/tewovumeniximemak.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/jatenefere.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f7e917f9---paxawufavaraxu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/46407886074.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zupolubapemekeguduf.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/kufukafogevamasediwufiguk.pdfIn PDF document text
    • https://digireg.cn/upload/sigokitalom.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/tuvanejunuma.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/c5e7b3efb018e718a4f9c3d4d7043f38/8639459901.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6b91bbadf---jovexokedunezefivi.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/kusejalamuvuwokorisamix.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/85340324511.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/totitumobafolazap.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ul4a58nd8lmh9rjkq3vppnikpj/tarogilararikulezekare.pdfIn PDF document text
    • http://chieucoingason.vn/files/15956488524.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/47f11d786e014195f58b3721e5bf3121/58550172169.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248fbbac2c---sifapekowatanubakoj.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_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 18404 bytes
SHA-256: fde3250276ff122395bf407498c42c6104108d21dfd6c421436dba353d0bdf93
font_01_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 10744 bytes
SHA-256: d115c1e156489d92f5aa16cbc77f88167cdfed104600f430b1914d99dc606083

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