Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3859baeba8a82a…

MALICIOUS

PDF

136.2 KB Created: 2021-06-27 21:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97eb2087703ccbb6edb9383bd63dfc6f SHA-1: c2b8b95cdeeb422ced59ecb381c058f9b1d724df SHA-256: ce3859baeba8a82ae59a648c15afc15fc551db4dec71f522b7f3290e38d9fb7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sbstroy53.ru/img/files/jisanemujatexo.pdf
    • http://andrewsexes.org/clients/867461/File/dipotudazikadeziwepubomi.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/22652199657.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/17214826543.pdf
    • https://aimara-bg.com/userfiles/file/kexoxugo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2933a0f3c6df27730e5a17070c844fe2/xotuk.pdf
    • http://dfh-consulting.com/userfiles/file/kedunosopeb.pdf
    • http://bensonlandscape.com/editorData/file/jemizagalodam.pdf
    • http://quatanggiabao.com/images/uploads/files/vozuza.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c06d73f620e4dfa5caa950c6e85a0549/gedusatij.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/m9oerk0692tlrfoan8mngreesp/sawowulefi.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03997c0d33---52008165441.pdf
    • http://distributoram.com/files/file/jasuxigurarofebile.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a998d0301---zikikarititopuv.pdf
    • http://volamtuyetthe.com/userfiles/file/runux.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/176ad16b8f8779331b2abedc3f8c2116/ledafiluw.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eac1b5990---fimupedimezozifesebuzivib.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/kkc6r8sdvhuffcp6h4pm88npuk/sitabokemejevibokapox.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/leo3encbkdfaok999v8v6ns1f0/lasununajebutivobedale.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fcde72785---sigonewovo.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965f9bbdf---32820088532.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b55af068---73102939139.pdf
    • https://papiratisk.cz/soubory/latibipirifukari.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+tall+is+vegeta+from+dragon+ball+z
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ca6.bin
0968315d74baa86688246b919652579202bc89d6940cfcc9eecc7330a9fc6b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA6 11040 bytes
font_01_sfnt_off00017628.bin
a40a2539da612dc58b4de6abf3e9987119f39cf2745326e195498eaaa7b80ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0x17628 19424 bytes
font_02_sfnt_off0001a903.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A903 16792 bytes
font_03_sfnt_off0001c111.bin
4efe08d71babd333c4577815deff70c3d5bf50ac7532d2f59270fed6499f9159
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C111 28072 bytes