Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7d4de1e5f229b6…

MALICIOUS

PDF

80.6 KB Created: 2021-06-19 03:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3224fd98be87456ffedc193acb9d1c0 SHA-1: 9583a06cfb63642f372e2f9d9f4af55400b0d031 SHA-256: 0a7d4de1e5f229b6cb2ed3ae141e48cd9e7e5625a94486f7a7d6812ef4fbb005
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a199252742f0bab87d760c52ef9a9bb9/86543324561.pdf
    • http://occahomesearch.com/userfiles/files/36430375157.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b68d78953d2---80740334726.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/l1rlv0mp65v4nb57qj5g9q6cr3/6766367605.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb820176e9---komopaxa.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b94b3fe6c5b---sinuxekadosix.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/32975866525.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pukepisep.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bvovkp2l86v52flhkcqqfq40d2/fobawedudatunamoxudi.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098806247d50---49671796881.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/td9q796lhqi2ok6c7mkrddbt71/pixomowedukanofobi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rugpvb9ht7td6bmb1hghubarf5/fasopapuji.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labedufalef.pdf
    • https://ilmercatinosottocasa.com/file/81794327687.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3db91db84e385e964056363f463b2b52/72014675403.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c3f92b46---99880834681.pdf
    • https://bacninhonline.com/webroot/img/files/47982709100.pdf
    • https://artlabjo.com/userfiles/file/23728160168.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=scan+multiple+pages+to+pdf+windows+10
    • 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://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e1.bin
ef74cef622834e2fb8e809a6f17a97918352e9cd805bf7792e73f0e98465090c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 2904 bytes
font_01_sfnt_off0000ed2d.bin
a04804de4a72738ca4647661f1953be12b5453a51102f8e82a0217e8f884d66f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 5648 bytes
font_02_sfnt_off00010064.bin
344ce900f7385213f652c1a9f4e3436f55982afb7ee4e004b4201aab458b4913
pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 11080 bytes
font_03_sfnt_off00012628.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 4324 bytes