Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daa7fec02f5113d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 08:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e3c271d02768afd3506a032e65fb2f1 SHA-1: e1bae17292c839bab321cd903ed8a77f2bda096d SHA-256: 8daa7fec02f5113d7caad056f1020d352b2da73498e5e5d04b2f2bedb074218c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to various websites. Notably, some of these links lead to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://gamepinleri.com/calisma2/files/uploads/59206021672.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7cd2268---10014295615.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615238ae954f5---59393085391.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/rasiluw.pdfIn PDF document text
    • http://infosierra.es/images/editor/36815286112.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/44851406259.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/sumesemasisonulegevolasu.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210926_EAD6D626F6E7ABC8.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/689b01d6199663b8f62c7189e155698e/fizodedap.pdfIn PDF document text
    • http://jph.kr/userData/ebizro_board/file/93084274847.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/mumij.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/telimidikajinego.pdfIn PDF document text
    • https://sadex.pl/fck/file/fujedavegedoluxopiduma.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/rumuratexajonosoz.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/18839568121.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631274003.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/41544563863.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/69688677074.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/31073534694.pdfIn PDF document text
    • http://coumert.com/images/file/44776997446.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/jivimobezuvawevozosure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+i+transfer+my+contacts+from+one+phone+to+anotherPDF 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_off0000af92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF92 11028 bytes
SHA-256: be80ab98007176788ae741c15e09f541a265885fd6ba36801f13d7746e8967a3
font_01_sfnt_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 14364 bytes
SHA-256: 517af74cc54dbe328ba9cf8ecf20aa975649f1021ece520bb354513f9bbc6804