Malicious PDF — malware analysis report

Static analysis result for SHA-256 583496425f71f435…

MALICIOUS

PDF

130.2 KB Created: 2021-07-19 20:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1bf3564c9cacd466136f80e2c0d0f68 SHA-1: 493507497a23602bdf345d8dd8c2f0d2298a2156 SHA-256: 583496425f71f435a5ae6218cdac3c104216c133fd3eb6c23e1a9f4746199c04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely serve to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the presence of multiple external URIs and the link farm structure indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9675

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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f9b544b26---kirel.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/mobovirosafojewutuji.pdf
    • http://thepducphat.com/upload/files/zutegiw.pdf
    • http://icmasistemas.com/userfiles/files/sutusevanepufuxaxuxama.pdf
    • http://kayapaliinsaat.net/file/60513838768.pdf
    • http://kasystemofkarate.com/clients/861259/File/rolorosivososegowur.pdf
    • http://jrmhandling.nl/upload/file/43146367435.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a896df5ebbe2c445c0b955c07786b990/posikitogud.pdf
    • http://ranaghatpchsschool.org/userfiles/file/77712338365.pdf
    • http://dongshengcable.com/images/upload/File/nawedejulixo.pdf
    • http://huntland.hu/upload/file/64060177272.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/64830272193.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/42890492454.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ojqfh4f4oiopqmemln1b2f92s6/donobuweduso.pdf
    • http://sushiosushi.com/uploads/files/narumefik.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d993fb60bc1b8c3fd737bd21c2042b2f/xafopifodalagogomo.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6804dee78614fa81120308c6036e16b1/28425599158.pdf
    • http://goteneplast.se/files/images/file/zimimejesabusopalema.pdf
    • http://wingmanplanningdemo.com/userfiles/files/fovozuwifupesavemalu.pdf
    • http://tunglamgarden.com/images/fck/file/zorovutunanekonaziwurol.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/6a309c0fbcd02f3aa868294d34cca17a/lapakofapuxirofonigij.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c234f090d7c---24774072256.pdf
    • http://446888.top/userfiles/file/37600726981.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d2d3d5acdca8e197ffb99ad61d7d9ae/15364049923.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29e18af20---8183953891.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=retention+meaning+in+malayalam
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e17.bin
5ce8672550ba0697dc81f5930827a2c9e4b86aef2eff2f4281b73a3a9d6ea998
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E17 10340 bytes
font_01_sfnt_off0001656f.bin
b79b5b783f9f2750fb1a468c37c2e1239a95587a9898e49e55e45fafda568ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1656F 16076 bytes
font_02_sfnt_off00017a8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8E 16792 bytes
font_03_sfnt_off000192a0.bin
23547ffa520b360f7ebc4c556c862a8e4d6cfe917a030ede4bc318a365c00893
pdf-font-stream PDF embedded font (sfnt) at offset 0x192A0 20556 bytes
font_04_sfnt_off0001c69e.bin
723394c21648b751b2b383304fe900631e5044eb0dfb37390295097bbc3e4958
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C69E 17624 bytes