Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7961c902fa35c4…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 07:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 867dfa52b73d708b85624efe8a469fbd SHA-1: 5d8d8d1de567fbe9d94641fea8f1ac80d43c08eb SHA-256: 3f7961c902fa35c412d312531b476c1dc38935a13aca7816c020a994dc1b019f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple disposable hosting sites, many of which are compromised WordPress uploads, suggesting an attempt to distribute malware or phishing content. The presence of external URIs and link farms indicates a likely attempt to redirect users to malicious sites.

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 https://garglob.ru/uplcv?utm_term=lucky+patcher+ios+download+free+ipad PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613741086ff4c---36503008475.pdfIn PDF document text
    • https://medius.sk/userfiles/file/5492370834.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/26969075758.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe0dd9b52---bijuvakuvepeg.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/mikebexipimajimigapikajaw.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109071335049700.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76883790697.pdfIn PDF document text
    • https://bor-diing.com/upload/files/sowubuxenesodex.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/natuvamizadojorezubazifi.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/52466976014.pdfIn PDF document text
    • http://wixoon.hu/upload/file/vakimuwenux.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/3805335702.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/31832905631.pdfIn PDF document text
    • https://digireg.org/upload/fovovikun.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/mukumoxelimeteva.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nonikiwepaladitinilixam.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780d41bd81---ridokobosi.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/85140702955.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/7870964298.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/92865836525.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/xuwivimutulasezusa.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/88049276845.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307eb8a297e---janumaxizakoxukasotuf.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b138125cc6725a14af70b89c4b817369/46687010449.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_off0000b418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 11064 bytes
SHA-256: c53d799b0c423ca0ed4564babb2e832339da6dd501b88b0843882f0860f7bd15
font_02_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 16304 bytes
SHA-256: cbc7df7f5ea496da6a7e72aa74ef161f9cc5b52e89ca825dd3e5be4ff542667d