Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c916d1757ace2c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 06:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 457e35aeea048c31f319ff2ca95b2e08 SHA-1: 3358edec31172fce58caa7b1974f617780062380 SHA-256: 64c916d1757ace2c71f0a31c9dec531569554594032a5b606d8a12f8dc9c3bdc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly supports maliciousness. The embedded links suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://archism.ru/uplcv?utm_term=functional+groups+in+organic+chemistry+pdf PDF link annotation
    • https://processwork.archerhuang.com/ConImg/files/zasadiwozusanozuwe.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/zegoderozagoponukosefoxal.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/wuzusole.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/nekedeguloduxe.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4eb47710f5855b8ef77932c0a0ea5d73/40343188921.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/bewugetosatebareroxijum.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/saximaju.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/tagudumo.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/1353235403.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/82070587072.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/87556724641.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/8499465418.pdfIn PDF document text
    • https://togeltop.net/contents/files/nerirez.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/70231987978.pdfIn PDF document text
    • https://eclearusa.com/images/file/37606419579.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365f9e7c6a3---vatipeja.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336aa3acc30---57338549258.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/67074127264.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/votitutarokewogixexuvawit.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5bb34ec6a68e0c0a6a24c3935272c75d/13639042301.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/sugomifaxe.pdfIn PDF document text
    • https://durimawar.com/contents/files/sufawim.pdfIn PDF document text
    • 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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 11256 bytes
SHA-256: eecc00e41989550700ef8ad5e8c4efde5bea11b9d10b88791f590f974190adea
font_01_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 15796 bytes
SHA-256: 06f3356e270a7ba6aa2c2b34a475c2800a160cb78d08db5aaa86ef0977097b2c
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1