Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4a5965bcdee0b5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66e70f8e5762bc4607670bcb4eb42bcc SHA-1: 74ce67948779a4beb5b72f64f8f6cb6219800f7c SHA-256: 0f4a5965bcdee0b5f11e7488487e6b360638eebd5f7332655946e234555e6f98
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 a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest it is designed to lure users into clicking links that lead to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/43cd5n43ftq0u7k7ef3fgh0qk7/gijuxemaxigevibegisugal.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/kofesulurepez.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/ludig.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/85410068700.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4723cbdb820ba5c53a2b122a9d5d7d0c/20573237731.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/bibigijobofiluxezezituzo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j14sa3b8poak6fjge3ju8m5jgr/6318061601.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/45038100168.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbba4d419e---suwolozarigusikab.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/70401862994.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec506e3b70e---simomodisiboragiv.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvtj4n3tkjjgqm8d1s9oh5lv6p/56025524929.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b99b85c6557d7a4f62151d446d9850d4/tobifudasanedufetawojoxer.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/gopatitabelijap.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/xuwerebizesidufutabeb.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///wofudolakebixuxirenunun.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210522141640.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xatemajiwiwid.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/84695011055.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/bowudubiruvusovajepu.pdfIn PDF document text
    • https://lapakunited.com/contents//files/luwanigetuviku.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/m1to3ek3c2rq20s9jh8uihb8c3/31422002992.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382d0ab9a9---84034593356.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/tifos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=our+systems+have+detected+unusual+traffic+from+your+computer+network+fixPDF 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_off0000d9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FA 11472 bytes
SHA-256: 9d0b699135e030bf9e0c275cae9c32aa5c4951cfbc86774b2586b744a79b54b5
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 17948 bytes
SHA-256: 6e854db5e8bd1d97fe6985131d76873b2b860e804dd66d9d20338274d276d419
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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