Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fe2f68aa1e60c6…

MALICIOUS

PDF

79.9 KB Created: 2021-06-11 06:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e84b64fa2630c03e6c58d66e2ab08d11 SHA-1: 3ff192ea7d393bf892f6000b4946c1df09a735d7 SHA-256: 42fe2f68aa1e60c650c2e62034afea74768ff261ee7d92df7303e366f029300e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, likely intended to distribute further malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=resumen+de+hombres+necios+que+acusais
    • http://kulturazebrak.cz/userfiles/97140128674.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb4646e16---resozapokokekodizaxilo.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/uq0uumc56g34700794e2tnmi48/mivupajogizuzifogonag.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fog178plcqgh0ssspbqos8bkm4/75502860459.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/b12f150b5d3c9f4ab0b0645d98fe5e1a/58540345976.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e026a0d92a---71517400336.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297216160---jirapinotabipevorud.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077d8c530d39---45327705710.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/eb5a7f055dcd328c15476b2a38594793/31874430570.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160802c4db212a---35395175860.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7eace84af67f91cd9aea1836c332d3f2/8382648866.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/13765848002.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073e833cf7f5---xifuwixuzu.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6e8696624b850c2bb40cfb5d9ec9e2a7/fewibimugekesifoluwodove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb32.bin
c97331007566177f8bf36ed99803cf89e553a74042dc8defec5bb48089ef52af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 5220 bytes
font_01_sfnt_off0000fcaa.bin
d23da785440f5ecdc8187d527cd35b0b931e6571b77c2af77a6d7669d5cdd79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 11836 bytes
font_02_sfnt_off000122d5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 4324 bytes

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