Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1be5d6de670f8d4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 15:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c196131bc7def94c6c3a6550aa249ce0 SHA-1: e9a1b4a457525213af5e3305da0dc93010d9edf7 SHA-256: b1be5d6de670f8d4cf925cd56a867968784d12f0379f3b34955121943a144fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=expedition+to+castle+ravenloft+3.5+pdf PDF link annotation
    • https://termokingbt.com/ckfinder/userfiles/files/womalisefutikupudixonako.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/xomofidiwotekajepe.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109080722004223.pdfIn PDF document text
    • http://state-lithium.com/upload/files/sakiwuwos.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/50033167857.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139c4c21c643---95228923004.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/38956138241.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342508ec2ca---xonagizotaxufuzelovogago.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613434bf4f582---juzosu.pdfIn PDF document text
    • https://go2germany.ru/files/file/fepef.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sujotonofin.pdfIn PDF document text
    • http://twilaw.com/files/files/raduvudasejozij.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132db473d57a---gelifejurilupemotik.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/19809031240.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/joluvami.pdfIn PDF document text
    • https://adikmanis.com/contents/files/ronujomedowunu.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tajedifi.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/7144595956.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/zixagadafimozizotex.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/ridunalawokemedadakuku.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/27063306898.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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 11136 bytes
SHA-256: efa2a03dae721627083332e247ba9c25e31be00eccae4ffaae09c40cb2489916
font_01_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 18064 bytes
SHA-256: c573308bd23079210b403a60480f789c883663eac3498e235e0a16e767fb7d30
font_02_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1