Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df9c2ef1a2824a0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 00:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 772fd72c256e12b15bffed3836c65008 SHA-1: e8ce1e177f894051b942098b547ed52416a905a9 SHA-256: 7df9c2ef1a2824a08dc7af4987fa2e9576b43b7dfea1966a7829e5f9554c8272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.predia.cz/userfiles/file/53005548169.pdf In PDF document text
    • https://lapakunited.com/contents/files/ridajafepiwaxodo.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/ditifito.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/685551736.pdfIn PDF document text
    • http://bdsductri.com/upload/files/liwiragopufi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109041023489820.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/55577295187.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/sarawenexukuxud.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/womezujegitujunujedififa.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/geruwelilavaxofob.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/penuk.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/68814075788.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/85119817429.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/70625017263.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/zukugemoda.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e15ed94b---32216713498.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109022327297605.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/sawotapuvukesabet.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/7928370319.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bokutewuxijipuv.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/9970103984.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613221f624916---50159151587.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/928748a95f4a9961d4afe95797e79bd2/vogitofulegutowutivin.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/sukag.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132bd4d8c7da---nefitedakukef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=redmi+note+9+vs+note+9+pro+cameraPDF 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_off0000d192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD192 10908 bytes
SHA-256: 6bfb374ba9d82b01a79236cec5e4101d56d7729e72da36519a96ac98ec2b47c0
font_01_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 19332 bytes
SHA-256: 1a86f2c5c91fb2a592a59683e7d81bde7f6a5c3919b2cdc8e2e6056d7bf1d4a7
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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