Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffc27f76c15350f…

MALICIOUS

PDF

80.8 KB Created: 2021-08-28 23:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43118f38235e2a1dde0610651a0c4db9 SHA-1: 9db4b77d81cdeb2360bb157d31933b355d9ad84d SHA-256: 4ffc27f76c15350f56c5ae69c43262f78d569a01cf296f03442c19e9fff32c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the structure of the PDF suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/eao28chldse2eajeq2tvja7eu1/wiwivopep.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb0ae35ffd---63255210004.pdf
    • http://mariancozma.com/_user/file/nifojudozoredofizo.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ms4hp8d1apmrrv2tu196toij95/sivabobufabuvovagejilij.pdf
    • https://watertorens.nl/userfiles/file/guvokipaxudivozenes.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p89u066obrrsbl0u7ulse9tmni/17802782296.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/950a28529f2f4aaa57dbfd971d6ed615/soxutu.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ohsobcfkvje32r10c1e5i51nfj/weron.pdf
    • http://zeci.nl/im/image/fiwidigivijosixoxoke.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5bba9720c---76306625466.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dusu10og0bd8iadou5hgr6e953/fekuribobokevuliguw.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070c39e0ea9b---wogenujigo.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/1e6fqjv4fd8qqht212v9pfkkr1/68378897982.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92a9b9df6d---pakurakekafekot.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tg9c24cvupmdkadvitjnde0si5/38659538632.pdf
    • https://a2designbg.com/userfiles/file/39983331810.pdf
    • http://topas.lt/userfiles/file/sovajinodewebazarakopokus.pdf
    • https://footballsod.com/images/ck-uploads/files/82480400875.pdf
    • http://bagiez.de/userfiles/file/68632679061.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0ersmhv56jg8qusad9ub6luh8p/28287114100.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jrkv74vmninongigji2p0r9h96/47857147022.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/08b60924d05d735d483eee1c25cacd93/juwedulubofisagawodusu.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e7e4d36d---48490007501.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7d016b53fe79ccb6fc623864db591b90/nagaforisibumiduzumi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=avg+driver+updater+activation+key
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16792 bytes
font_01_sfnt_off0000f012.bin
6fe47187d42e947eed01d148ba97a9cdb9dc04ec3fd0bcece0759ee0cb3b6082
pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10828 bytes
font_02_sfnt_off0001090d.bin
b10c51d92eddf2e1be7df0f5b1ca99104cf18acac5360f8726eba8235c6299d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 17120 bytes