Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af2788e9b1a4232…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 03:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fb581a5226ee22780ba761da81a9eda SHA-1: ed2935e921b6289fb94cb2a19b95de81bcd56cbf SHA-256: 6af2788e9b1a4232a251db99c28bc6e99b9b04951a987b61425027e1c5b5730e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which utilize compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/3818023870.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/fowabubigozafuripitomekeb.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/dapexilusinavas.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/83983f39d36a640c2e7f799c1f0d2576/3233283588.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/pabufurugu.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/natojawezefumalemiz.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gosis.pdfIn PDF document text
    • https://ntc-container.com/upload/files/22720975950.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/73519415591.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lulekefotuvigawi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c201e966d---92743677434.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dec927048e---jomokuxelogikanusepute.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160910a9038f9d---24908983884.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/84771436771.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/98079028013.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/seketosuzonopokidovopiju.pdfIn PDF document text
    • https://icbacademy.com/upload/files/50820475400.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/kumijodejilafexugozonixam.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fb29fd27013---lovenorigokewebulezilul.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758773e2aa7---22012895004.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/veliripu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/24592341080.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/jiwonuguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marte+humberto+de+campos+pdfPDF 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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 10876 bytes
SHA-256: ae5fd68db5b22e68311011eee411813d8cef5f958c2e6f702b1600e9187374be
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 20860 bytes
SHA-256: a53d8eb86223f042174341d8f916f269d7919e76746a6f31d6d368f84f394c5c
font_02_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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