Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e53d4670d0bd250…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a03723d4f6ee2d0137ffae3f2f42f084 SHA-1: d50bf0b4b23f71bbf5f87710d85b997eb9a39695 SHA-256: 0e53d4670d0bd25081fb7a4c67d2bd1c83e514cfab24e2850b62f0ac76116f36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=rank+tracking+system PDF link annotation
    • https://ww150006.linebot.net/upfile/files/20210911203833.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/rutovozidezefude.pdfIn PDF document text
    • http://chapelguild.com/images/usr/sesibapuvula.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210905184642.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/zixiketenufug.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cefed94b6c3ff79840c33eab3deac47a/zanudumudap.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c15799018f---29151934344.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/fawisedexarejaxolurem.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/75074369268.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pinurevuxaxosaxir.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/mutaxemawosozetewukine.pdfIn PDF document text
    • http://njchemland.com/upload/files/15291732486.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/kijuvotiw.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/79792721334.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tevizerotifip.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/fabiw.pdfIn PDF document text
    • https://termofriz.rs/files/kepiduvozalapukalexaf.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/88376341162.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/47195756191.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/57091911602.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/12659063736.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/pirutebajanaba.pdfIn PDF document text
    • http://dakov.hu/_user/file/41558076795.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/56499873189.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/vifitoritirebibuderowenu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf56ea503e---59354488559.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 17100 bytes
SHA-256: cf5b2e158ed71234638a312e30a8bb5037bea0c2475dff31797159407e74a116
font_02_sfnt_off00012bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD9 10656 bytes
SHA-256: b2317e8ef058d7fe7cf6751683134bb7e800394a5d42003f3a8b9ab275ff9546