Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73e7c71044942dc…

MALICIOUS

PDF

115.5 KB Created: 2021-07-21 10:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 041ba9ea4f189c3d464a0ca63772c636 SHA-1: bc52a2cbf89343f201d52870f888f3f9371f1690 SHA-256: a73e7c71044942dcbaef7782a96500c348991d6d31d0e762a7a0cb82651b7005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external websites, with several links pointing to compromised WordPress upload directories. This suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9669

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://zebcom.in/userfiles/file/37234914940.pdf In PDF document text
    • http://logo4you.dk/userfiles/file/tamupomutazapizaporeti.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/murerokof.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/91040107049.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/94950997901.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/78484103131.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637da7bf6c---95775839703.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160832e7cc0e3f---63217730212.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/30314443076.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/mawukexafumaxifikajidami.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d735af1dfabe5ef86ffff3db066c3cf6/38929457244.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b8e84c70---sukivejupolapiliwusulik.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/67000374479.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/81da36cb06e1e7cdef09a6b06929d27e/vuwejegadefapo.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/59226852785.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/23384112050.pdfIn PDF document text
    • https://marosme.ro/hirek/file/beginepo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806e7c14558---lekeg.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/99e0b68aac0ac9070a6ebdacde3309de/77404564480.pdfIn PDF document text
    • http://rkdestate.com/userfiles/file/75054494423.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/86a7230d87b36a857365ffcb30043318/pewudizedixobesegepapida.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gaxosubigekukebegeraju.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a163ae512acf58df5ac7d877881a6763/garuratilex.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/70784893704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ottoline+and+the+yellow+cat+pdfPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 10672 bytes
SHA-256: 9e0f1c65db0cf6612d85d67ff3e178c19b51a1e060d3c252b8b79af44d860f12
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 35956 bytes
SHA-256: f4189823dc1f8399fa6157e1d89c5040fc4aad059a65ff8ca4c44682a5105799
font_02_sfnt_off00015df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF0 18848 bytes
SHA-256: bb6ca7b555b7747482fe88e62673f61599a6579162e8954faf53b66220b73998
font_03_sfnt_off00018f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4F 16396 bytes
SHA-256: ade50039e1c1e6bfe8de41d26c60bfd5d49ae8b3a02ede483b2154a6351fd8ef
font_04_sfnt_off0001a5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1