Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2407ebcd0c6732…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 14:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12c3ef5970746836dd7f6debdac2a8df SHA-1: 66394868b9f166018de681e5b14ded15a736108c SHA-256: 4b2407ebcd0c6732030e99350c1bae5bfc3389d016a6019f34e0222b6b17c7f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources. Several of these URLs lead to compromised CMS upload directories, indicating an attempt to host malicious content or redirect users to phishing sites. The presence of a link farm and compromised hosting suggests a multi-stage attack designed to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jplus-ag.com/upload/files/BodyFile__60C8EF563F455.pdf In PDF document text
    • https://next-engineering.com/userfiles/files/wusefibe.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/81937813776.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16102b53e93b71---11590839179.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b55f09b39---pomemawalawuromujositojak.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/d54de105c5d505f18f866a5c67ca621b/29674568924.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/80666651279.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1f78a283fb9862cf953c063305024a71/wuvatodesivusofasaxenun.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/86340806056.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5596f69e3b---32308367947.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/fexarezibebubeso.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/migovoxufuf.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/pogafetafus.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a83feff42---90079006834.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/zonifidemafetejanikowi.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/49343679662.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3mgrbttpauht88hiqu9k7b4m9a/72325251718.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac76f5219f---xozobazujelavamikix.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/65329691365.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/96478069071.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vufinitujomelilebot.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/wowup.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/zokanelekoxozej.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/81209277008.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jufosobiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=introduction+to+international+relations+pdf+free+downloadPDF 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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 10752 bytes
SHA-256: 420d7caa501d2b20353f197365d27d70fe670264fa03914bd89c4529b2cf5d09
font_01_sfnt_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 14868 bytes
SHA-256: f594411fbabb9f9ab10c77f42662b644c2a79a14f668cd917741f6b06f28ac14