Malicious PDF — malware analysis report

Static analysis result for SHA-256 855d281d415b5aea…

MALICIOUS

PDF

102.4 KB Created: 2021-06-29 02:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60bd630e43f889f5e26421d8596e3ef2 SHA-1: f099af9eeee54f721a4bd5f62ed1fe420f9f1170 SHA-256: 855d281d415b5aea1fec9591b6c19e94de4fcee3ea2d622884f5c685dec7f716
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ml1shdf44c8uvg3p40f0oo0tuk/24687912537.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/oclh79n9t0fhg6dkne24qd4ni9/ritafesebeg.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/e442fe6e745a7a8d34ec5472a4c61203/78459798057.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/80029909714.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210611145237.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/19oa9qeolbn29tupvuncenrl2f/morolupuvepadi.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/budejukixapivef.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922efc49288---kofegomapumewoxe.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/xomosigewatirigu.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/bimefedesevikamote.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/12796675338.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d93a52e23e1ab0316b61d3a1e5c0e3ad/61275866386.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/xalomi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae8862253---wedamokekim.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbdbb617b---88999565202.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s4p701s5jsfs73veee9dvgiea5/bapujabab.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/48flrqs0chl74nfarfsde63ree/parutisurawiwa.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b51498d3008da2470fdb536e76705ace/90749648592.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/76fc8320bb541cc755e69e40c225d778/vufuwakimofikerubamimeto.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a4a5582a764f9c8d900e9f5dee5c0f1c/dugison.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec5815507d5103310f800ab6e7d0e043/92542718482.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/zusidogafowaned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=4+types+of+performing+mise+en+place+for+egg+dishesPDF 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_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 17828 bytes
SHA-256: 83fbb84d77d5175ddaab94ee725e9dc4824a0aa4e13b98da99cbb09832c44b16
font_01_sfnt_off00015a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001727c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1727C 11164 bytes
SHA-256: 38ebe90dc07975400dc29d14061c9a39fe6f75354091c353bfc199957df831b7

Open this report in the interactive analyzer, or submit your own file for analysis.