Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f45719dc11ee88…

MALICIOUS

PDF

72.9 KB Created: 2021-09-23 09:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86fd25811d76a8e3d59eb2423b2be66 SHA-1: cd8240280d120d9d5177f3c105b461015e5c2004 SHA-256: e3f45719dc11ee8852f70b10a0e68a72654489291dcaa1d269d25491c14d0829
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The embedded JavaScript likely facilitates the download or redirection to malicious content, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=go+earn+apk
    • https://shellserva.nl/docs/Image/file/widiwesipililavoteku.pdf
    • http://realfootball.gr/userfiles/file/wobeluzizifupirejul.pdf
    • http://lapawan15.com/shop/fck_file/file/visukigukebuxawejipe.pdf
    • http://majstrissmt.eu/www-data/file/vifixusowitazab.pdf
    • http://taociren.com/upload/file/210903120003650127j2g988o0i13v.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161306c040f579---86925921848.pdf
    • http://schokobrunnen.com/idata/96726458857.pdf
    • https://ap-qatar.com/userfiles/files/83665230188.pdf
    • https://dienhoanghean.com/upload/ck/files/jusajijopatipabu.pdf
    • https://senegal4d.com/contents/files/visefun.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc57a6c82---33432545534.pdf
    • https://vibangthuaphatlai.net/uploads/files/nukikovixus.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe40d234bb---68854693919.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/jukapubaperij.pdf
    • http://hpworld.hu/data/pic/Image/file/gajed.pdf
    • https://alternativecarrepair.nl/userfiles/file/55332530704.pdf
    • https://isitekmuhendislik.com/userfiles/file/tetidelofa.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/bepuvexosazexidig.pdf
    • http://refinerlink.com/userfiles/file/solukaloz.pdf
    • https://laznia-radom.pl/userfiles/file/39940715571.pdf
    • http://kuppersbusch.hu/userfiles/files/70776405520.pdf
    • http://teifsepahan.com/files/file/nubibajikibe.pdf
    • 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_off0000bb7e.bin
f7bfd2b5d25def46e73461f26eaf31ec25e0c8c218c1c8533bdbd2d4e317ed96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7E 17256 bytes
font_01_sfnt_off0000e7e0.bin
b5ab3b7985df32223b758aac29f331944c290abd895e030195cb8a89b4e8d2f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 9972 bytes
font_02_sfnt_off0000fe0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 16792 bytes

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