Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3f6c603189da66…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 19:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 07b27d649b181d16e154234464464115 SHA-1: 9e020181283ed8c78dd9fe2f5fb3a208a833ac3f SHA-256: 7d3f6c603189da66d44c4ebb77f39e8552c9d2fd913003b4cf8170d8c3a73796
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or host malicious content. No scripts were extracted, but the presence of external URIs and compromised hosting points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://www.borzabadi.com/ckfinder/userfiles/files/xenivixosut.pdf In PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/29816709150.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9b09dabb---32098448176.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/11015a39be2d2fe987926eabfc9d5f49/somufuxajugirivexozikuw.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a685fb96136---sufaw.pdfIn PDF document text
    • https://congchung7.com/upload/file/78190272617.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/pezonujawefasilubap.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/13282474458.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5af6d67c---16265454385.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210604_EC1EC99DDEB00AFC.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23b39b24e---55795891891.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u184h25kg81lp39j5c7sudmjl2/36620485255.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bimiwiwevibi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd21f289422---48149872019.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/75166137623.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/95917599631.pdfIn PDF document text
    • http://hongdacable.com/d/files/pakujuva.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/64911287429.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/29822636811.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/gewapigezuzofazafodiwi.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052410420736.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/lujesijupikurib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=herpes+and+shingles+relatedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16328 bytes
SHA-256: 6be28e7b78dade8892b1e2d6380156cae5a353b45014957e1023259c733390de
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 10540 bytes
SHA-256: e9a399046a3a4dd7228b3b3f1e9ab30dffc537442cc5f119ecf820cd64853590
font_02_sfnt_off00012bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1