Malicious PDF — malware analysis report

Static analysis result for SHA-256 a878fa1f3d3673ef…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 03:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0415b8da3a0112c06f31a8c6dc30a5cc SHA-1: 948579ec6ae0a19f934fa5dcd0f86d4d7c90a673 SHA-256: a878fa1f3d3673ef78b07beb258b59ff03480c0668c79964fddf5dcf00c4d805
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ashioke.com/images/library/File/jivoruranorifogixetun.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e50fd2930b59ec799c0d98deebc7bb92/nijafedipelewutoj.pdf
    • http://www.bluewhaleline.com/image/upload/File/17873512741.pdf
    • https://lawina-radom.pl/files/file/werulilafezusumidalezid.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa7d22c01---ketutixegowudodebumu.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/kilagulugaxawemabetulezuv.pdf
    • https://echipamente-scule.ro/userfiles/file/3549575943.pdf
    • https://keluargamimpi2.com/contents//files/85459382581.pdf
    • https://aquafilling.com/userfiles/file/75359450805.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1271b435f---23182436044.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a7882b68895fd2e93d7451ca35f4f8ed/9372428784.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2df8a0f9fcbc79ce9fb2bca6d158c65/49661243440.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/53155542306.pdf
    • https://dodatnagarancija.com/userfiles/file/zufapaga.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ppl3k8l3if7jg82frndrqrcmar/80736845688.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/542caefbfcce3a9f77e6aeb5ed1f8e70/81206920610.pdf
    • http://nakatka.com/files/file/bifizavobax.pdf
    • http://humanlitech.com/files/files/vonibi.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ae52f85dc9d8b730169ab48170295f92/litunetaxefumuropofavul.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7f3c20ff---vivopozuf.pdf
    • http://apogeeconsultancy.com/upload/files/jofujepozezebibi.pdf
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/godov.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/2e6f4493bfc9f709884f8db97fe80da1/nosapiwabawiwo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=narendra+avasthi+physical+chemistry+solutions+pdf+download
    • 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_off0000d561.bin
8b15c2cf4a6b05d9a3209e50de7f071daf58f29a8cca3f6b6eaeef6826d89b56
pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 17888 bytes
font_01_sfnt_off000104bf.bin
5c727ff461f8729013d47be6f2eefba5cdc95255d85ff36354acce5e45d66b26
pdf-font-stream PDF embedded font (sfnt) at offset 0x104BF 11228 bytes
font_02_sfnt_off00011eed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes