Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1106e52f74e6c37…

MALICIOUS

PDF

79.9 KB Created: 2021-06-27 07:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e68903271400465db7fb585ea137a3fd SHA-1: ed37fc8d4818a16369e2baa1df1cca5f2ad127f9 SHA-256: f1106e52f74e6c377002adc1cb459e7bf6d7dfd6160b40d075bcf41b000e0c95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/jvtuovuad6nc2jf6oq7git0773/zutiluvixozidid.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5952342c---zejazajakomewatevogadi.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3e6223c20---68954359976.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45b5a518b---jifarorisagevagimipisogux.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4612d2bea0---rovisejeguf.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4419297e---vowupafivebipomizej.pdf
    • http://prmakeup.com/Image/files/dipepi.pdf
    • http://scottleddy.net/clients/862555/File/99398753417.pdf
    • http://ufnk.fr/app/webroot/files/file/29950206078.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c91d3942d---popasamavevagebariwemuf.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b17af0a29a5db96f21a56ce8b50fcfed/73121145763.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d541b9d0dbc34f0e91ed65c064af8a8/36204637845.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//59454327567.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/93gro4nf1u280a81mu142simv5/kagijetegilitiritexinaz.pdf
    • http://pusancard.com/userData/board/file/64097417277.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ec7353dfc---gevinovavesikavogiras.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/81fbaec4dc212bb6e07366af03c3aab5/jenufojet.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/masenasataxalo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc0005c97---55050358144.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ea08ecfe---44815436426.pdf
    • https://eternalbliss.net/file/63513506948.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/32453950865.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeb3db3f8---34892469425.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ford+escort+factory+service+manual
    • 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_off0000d72f.bin
8677a048380cdc802cfff5f12534ad58547407784b1c18b4495b47bbfa353669
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 10892 bytes
font_01_sfnt_off0000f063.bin
e903df89886414078a723735f6f87a5cf7944a30fc11b5e3610606eaf009ebd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16180 bytes
font_02_sfnt_off00011a6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 16792 bytes