Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f14bcc6f1259c5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 20:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 345c7f7fbaab28dc37a17968649ae800 SHA-1: 829b53a58780725ec85a6534fbf2b78aafb7e26c SHA-256: d7f14bcc6f1259c58b68b9d414baae5ae3a26b96270084bbc016aa0df3c8f7d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous external PDF files hosted on compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://arcomproltd.com/userfiles/file/fapededu.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/sodanidep.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607efffdbef43---85242675086.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba123a0d51---83183735768.pdf
    • https://ferado.vn/userfiles/file/35828141706.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe9349502---44106962655.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/bavogiziv.pdf
    • https://tyko.pl/userfiles/file/6822448570.pdf
    • https://filetorme.com/upload/files/29340896881.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc96de401---duvowipepinadoludu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b611f97cd1c---38706681325.pdf
    • http://bitite.lv/media/txt/122/file/71278396747.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/645a7eec3780aacf2af3d0551e4c1c2d/40776739818.pdf
    • https://matrainagycsalados.hu/userfiles/file/42407245504.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e3c71ddf---57141590511.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5239bea62---50955542324.pdf
    • http://alibabashipping.com/userfiles/file/vubojawuvokurajatenuletak.pdf
    • http://hncastlecable.com/d/files/40113493577.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f2862051f---lirawitikagopadosomitoxab.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f605d3cf4a---manurukibi.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/phlrhdtl00gd7nlo4hjkclr9d5/tusinewa.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f40fbf432---58826070112.pdf
    • http://kaies.cn/upfiles/210612154802091128lsgema.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f53332206881485bc43d78e4bdfecf83/paseborerulazaxowigiwo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=lupus+and+inflammation
    • 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_off0000f278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes
font_01_sfnt_off00010a8a.bin
8274b27364d3012b37ab54a13ee60926fcc61ae854e99fb4771291c494ea08ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 17000 bytes
font_02_sfnt_off000136a0.bin
e18b149ac86b5f9cb32cd262d4cf623961f2629a2991237275b4ed30187f24e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A0 10484 bytes