Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5112d759183cbfe…

MALICIOUS

PDF

76.5 KB Created: 2021-07-03 07:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 780803d4e53c2e9eed757139a532804e SHA-1: 234e2175a5c273b61d9d666666aa6263abd84e1f SHA-256: c5112d759183cbfe8f632f5b4fb384c9fae3e9797e5b9aff5a9a9b021cffd47f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms hosted on disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The `utm_term` parameter in one URL indicates a potential lure related to 'army of the dead torrent'. No scripts were extracted from this sample, but the extensive use of external links points towards a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=army+of+the+dead+torrent PDF link annotation
    • http://footstepfloor.com/upfiles/files/3161613688.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/fugukisemadaf.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/62855620576.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/59379034337.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/zawiju.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3888ac5f3---3690576786.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c93307d9296---kuribenalowakiseleri.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s37ngodhboobdkpi7sfchbebqi/fanusugetufugesivese.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/43007221432.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/82678893558.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9aaj0t2mjq7fv5ojbr3lttge01/75610909008.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9da7b8aa9ba8a1c9d8d8e85fc8b0a1a9/76636426292.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/38193380985.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/871751cc4269d25d73ce18db5f66caad/41173122247.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/17322942009.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c434cea06---zadarago.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69d6d2167---dijazovajo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160925cfe10a37---40498213118.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7812cceabf3632a16f204b573f737d66/62880369268.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/gigolivikamedofi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b68d606b59d238079bf23a41833c42a/11354626875.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/97197697706.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0638ed99ce25fd4906fc0b641a9656c8/33743902126.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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 19140 bytes
SHA-256: 8abae2d84301e58483f08c24f8d28b849464e2c0e2d427c0b9b4fa458afde279
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10408 bytes
SHA-256: f21c0decf39cf7d9f01769cf22a3f5af446be8adfd3405554cf590165cbebdc8
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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