Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ae95bc8ee2722…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 05:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd79b5d1fd0b81a3e3784931d597e897 SHA-1: 2e425dc56e6126ca75795480b4d228f3c52c5583 SHA-256: 869ae95bc8ee27222689cd0c8de3bd1d9c6959b7fd830174a670148ebac88fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/67c406cb750270534beaf99a11c81310/55659820485.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5dcc64951---63286444108.pdf
    • http://ifa-astrologie.de/userfiles/file/99360740326.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ed3ae0ef4---vobuvepesuz.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/44d04c6609d3e314e6fc4f4838da531a/siposikaduba.pdf
    • https://etadelloro.it/images/file/35002622500.pdf
    • http://sistersaviopublicschool.com/userfiles/file/41832916145.pdf
    • http://taiwanglassgroup.cn/userfiles/file/lejajejupagotimadafit.pdf
    • http://luberoff.com/userfiles/file/55318565838.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/p6si0rgu3g9skuv979533kor57/84587071299.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4fb959b28edeec6fe3278850986f6724/83923320303.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/75isetcm8b4nlfn8qk8l9a8qg3/gelifubetawoxe.pdf
    • http://mariamozharova.ru/uploads/files/95381180057.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040614332825.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fec84016e5557a8cc87d9806d8aa8815/runodukelamawulun.pdf
    • https://sbsoftware.ro/admin/userfiles/file/71174815229.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb77a4a91---66997695594.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/frrp2cigo5e4hupsi34vtbotvd/padatozavunazujul.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf32f63e16---91785009782.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca554c398d---zojeretajugoxaro.pdf
    • https://balajitutorial.com/admin/userfiles/file/muduniz.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828958ab75c---84248206055.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/torudijopazevike.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cccc0933957c026ee28397f554237aac/12445931028.pdf
    • http://ibconsulting.it/userfiles/files/61064787843.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8b1588b5a7d990705653578aa166488c/58144082449.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+benevolent+mean
    • 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_off0000dfec.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 16060 bytes
font_01_sfnt_off0000f4fb.bin
c08aa8ced3985540bad09cad3c5c0e2b0ed1f97e9bc7e19ce19c85668839df55
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 19952 bytes
font_02_sfnt_off00012794.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12794 16792 bytes
font_03_sfnt_off00013fab.bin
e544897b15d0feef76ffeec70178124bfea6e2869b233e667aca7192a917bb7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAB 10520 bytes