Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa9f31d7fd2a7ab…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 13:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5ac9404f5e75f15dc729504d8ab4ccc SHA-1: 385f89de69fd41a3d856bbaa2691dd6f27c7007c SHA-256: 6fa9f31d7fd2a7abd3c43c965c331526b789eba7a4a43ef29a72316afad1a37a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm or phishing lure. The embedded URLs point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crysiq.ru/uplcv?utm_term=griffiths+electrodynamics+download PDF link annotation
    • http://www.globalnautique.nl/upload/files/forejubadosogoge.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/lovurakugununebesi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc8e7d096---rawitukafe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fb591c9df5fa00bce655fadfe14f38be/gokazovudo.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/vufowepavoriwudiketovuji.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/nejebe.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8dfba3dc5bbd75da8afcd45669bdba48/45514712907.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/96809202239.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/40098117715.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/37259430895.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zanujagewokopojojuve.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/84546271457.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8f38df0724be801d635f95f4312c40f/38854695832.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141978598ca8---67281521812.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/xokiwiravabumorudipozap.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/73561516208.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/vafotokurerurorozitiwe.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/56902447624.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/65276506248.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/relakukowo.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/79870711422.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/88001170466.pdfIn PDF document text
    • 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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 20044 bytes
SHA-256: 036d754e31ca01434905bd0620d5ae205ff3aebb6be8dfa475c776968ca74c5d
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 10980 bytes
SHA-256: 5e4d3c5ac91856753322bfbb037ebf7428bc46d6913b62470d240def8a22d06c

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