Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6ff76715d73a7f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 14:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07e1bfd880f4bda028803c4564cb233b SHA-1: 3edd3c940010139822d90f677d3f765fe0a81621 SHA-256: ba6ff76715d73a7fa6349d95c6c14cc5fb5c5a6b27346925716dfd7bd5085d10
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised websites or disposable domains. The primary purpose appears to be directing users to potentially malicious content through a series of indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pescepiana.eu/userfiles/files/45372567364.pdf In PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/73160643203.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/31428887135.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/kefeguzejukumojilotogif.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb627e750---81533330182.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/91193797447.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cb45671543151f0665532dbc4b2111b2/katadipiwu.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/28184035694.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/86714015227.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/tipanodasoxexinizaxi.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/flq688pralpsc248va22tnc5m2/55659749350.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/11272846451.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/datowubijivimeridoba.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7200b4e3---39061283667.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/56935754261.pdfIn PDF document text
    • https://alariel.be/userfiles/file/sirugosuma.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/30861278810.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/62343492616.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zogepa.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/1019698269.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/fiboxikoxosomoxar.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a783c1acebaaf2b8edd673228fd7b81a/57655533270.pdfIn PDF document text
    • https://x-software.cz/data/file/lugipesetukipixeguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=miui+redmi+note+8+romPDF 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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10332 bytes
SHA-256: 163d2ce4bf3a382ab5ce3c7b6e2db5866c2edb492bb4000cc52885728980ff28
font_02_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 21956 bytes
SHA-256: 49ef013dabc11971e34f394a0828a7a6eed1aec443dadfe18b6846d8f58d1cf5