Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9995958bbd10d7b…

MALICIOUS

PDF

117.4 KB Created: 2021-09-01 19:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cca7cbb999327f3bb63945bfad3de5da SHA-1: e76cbed247edc4c90edcc16b02bdd6639ecd1e06 SHA-256: f9995958bbd10d7b5a1a7b2b413ee10cc8a720f4701561276f6e0b8d9df94fa1
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of urgency language further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d11277f8---sibuwagozokurifezagavaki.pdf In PDF document text
    • http://zap-interactive.com/uploads/files/32134529737.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609862f7994f8---nemazawotuzofalijefare.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/93988658753.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/rokapiwugisakiseviw.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9d60563102f4d2ac7dd40cc471d0dfdd/11435244411.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb72a38b1---29020291157.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/earcd7gct862g51usq2u25uceu/kevenapejolo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/959tbevrk0avl5i83kvvhtkh6t/23912733431.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/591218906.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gakesemubotufaf.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa36bdc12---40924030212.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/xotuwomaluropijuwagikemod.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/sigawakezokilisesepope.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/zaraweg.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dd4963fe---katin.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/koleve.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/86338016177.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e58c781---sixugasurakudosomexexitep.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/31581184678.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160967b979fed0---8316605128.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/xinoxefuwunupezujexajajup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=flights+from+athens+to+washingtonPDF 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_off000164f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F6 18864 bytes
SHA-256: 4f5357a7752b9ceff0942039cc889f87f0ed5ecb5e4bb279eff618ed66ad9e03
font_01_sfnt_off00019672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19672 10724 bytes
SHA-256: b9aeed18ac26ab5fb350ba71954f437ddafbb40adc88f23fc53dfb2f7b7e8fca
font_02_sfnt_off0001aeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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