Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cc83680fd96281…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 10:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1173eff660aa68ee4e033f6f483c2fe7 SHA-1: 7977ec6587071fa174bd7a4e09dba1f1c3c591f5 SHA-256: 42cc83680fd9628196e7469c416416db3a2db914d79a2f0422c2bc1c56d8385d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to various domains. Several of these URLs lead to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://ooo-kenk.ru/userfiles/file/wikomumimo.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a06e3bf2b---zutowomekejapubojonovesu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93b0fd3805c39ca6cd7435af08fe7fbc/90005919599.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/garakiwibusoboval.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/64632702367.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/timosijixalegipejukol.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/35837691594.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/10983937331.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/31080451226.pdfIn PDF document text
    • http://rhondachem.com/d/files/34284148115.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139616059378---74718081222.pdfIn PDF document text
    • https://buyafranchise.org/files/files/pusomigenataxuj.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/88931179262.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/nusifafovuduso.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/fuxijepipanudesugexapev.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/3717166270.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/74357754074.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/51955142407.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/08/pegesuvujawupanopud.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/14385254752.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/direvafefilotudo.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/dizusefazunamatinebix.pdfIn PDF document text
    • https://italvaping.com/file/rofubipatarovese.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/2156723001.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be1a61385---kunixevexifame.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62119088271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=call+recording+option+in+redmi+note+10PDF 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_off0000bddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDB 10896 bytes
SHA-256: 16cd2add5739038e707684a68bf550ff17393a2a816e107d6eadb1aacdc7af2f
font_01_sfnt_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 16532 bytes
SHA-256: 44e1c195fe81293e2392ccf76bb6495dc1c62d60ff6b4f3a94006ca7452cd454
font_02_sfnt_off0001014b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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