Malicious PDF — malware analysis report

Static analysis result for SHA-256 7790551f37f7dcaf…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 07:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e832c39c69406b4448412d75fe0201e SHA-1: 0b25357bea13995bcb32172e399d36415b67677a SHA-256: 7790551f37f7dcaf0fe371b6460f5306afbc2fb9104141ff2fd08f0b82ee5cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress uploads and disposable domains. The presence of numerous unknown URLs suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 http://riph.pl/userfiles/file/19893475261.pdf In PDF document text
    • https://psychologgia.pl/Upload/file/junarowekemox.pdfIn PDF document text
    • https://afayl.com/userfiles/file/51941223471.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/ponuxemitumogonujow.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/44786511976.pdfIn PDF document text
    • http://clingac.com/d/files/35925325563.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/potonarupi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/bozonabedususus.pdfIn PDF document text
    • http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/demupitilufefonotanu.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/babasuneveruvosolemewere.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2cc1d33fd---zogodokopatadonojuputolam.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/29603460584.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a6fe03797d61a92f442ad0a717bb89e2/88964330064.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/85888218690.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bewivagose.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/voxifuxikunuromapuv.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c86523a00---nusilusuxotoripuzuzudi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6853dcd0---balarabumibidaxonasawirot.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/70845377593.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/9993941926.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcca4dce3ca---91381729008.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b681e42d4a---95743926157.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/2727816232.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1302a6eb39---24837412615.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/natur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=inducted+meaning+in+teluguPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 10376 bytes
SHA-256: 980882964732c1441bfcbbd4dffac301b390da3d1a0555d6f55f4b09303e8cb5
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 19692 bytes
SHA-256: 3182739e0f9c8138d32a1c1a87ebefe7a215117a5f5436834f82b2a7328fb27d
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000139d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 16424 bytes
SHA-256: a7b64e7b85b2ab3f7ca9541c125969762efeb6741128221bda0543336a0a3716

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