Malicious PDF — malware analysis report

Static analysis result for SHA-256 112c08f2a3e78b9a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 07:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4afdaea875c8fba946070fb064b15d7e SHA-1: 9f5992c1e09add2f48106d0f0c849c4a318d8238 SHA-256: 112c08f2a3e78b9ac25d1ecc4816f5a56691ab2f71f311a90749576453c5cc5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures to download further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=field+and+fire+downtown+market PDF link annotation
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/86002661779.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3924295a91e4a2546822cbf66f39c73/53551223157.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/pozonon.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2d3s223nbptur6qciqnku2i4mc/66532660235.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/30780826942.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160913fa61ba12---fesafixatim.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3963966258.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe69cdc534b---56452283893.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d25d06a1---wevetujadun.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/92273316219.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/78246861479.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933fabe6872---25675060945.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/38537795522.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/buzozegazamunopowe.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a1781602e1d2f6a636b87ce026b567b0/gojel.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/21b260d5e349a0dec3deb81c76d22e16/83407865778.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f6c8c1ceb01a8150516fcbd347d4768a/legijumogubarowu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68c67f9e3---7790242810.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809b375082f---ziwolanupefexoter.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/76316836414.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a7101032---fuvuzawaxexazil.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/83049115946.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/37292882162.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077df45ad1c8---43423913864.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73dadfef6---sotakipuviredos.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 10504 bytes
SHA-256: 00c206ec91ee5e78ef7eb856f1ca11dd0dd570ebcd58fde74b1570989f2b7006
font_02_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 18800 bytes
SHA-256: b7e439c9d5ec416e4bb27ecd05b08bd5ae27b8d75c881f09db84e65e9e6e1165

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