Malicious PDF — malware analysis report

Static analysis result for SHA-256 71844c4d44c7607d…

MALICIOUS

PDF

95.4 KB Created: 2021-06-06 23:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b8df8fd42830f0c8f23b9b924c60ab16 SHA-1: 58af2a84d975ba1309f1a5d0e4fc0a9b7c5fe801 SHA-256: 71844c4d44c7607de75314612bcdb6e34e38f435c097d2e0bdea2bf1e6219db6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phish users under the guise of providing MP3 downloads. The presence of multiple external URIs and link farms indicates a clear intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drafthe.ru/uplcv?utm_term=rajasthani+brazil+mix+mp3+song+download PDF link annotation
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ec5788ac0cbb858039237f71c4fb0849/12857025472.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac71254124---xexativanipavitubi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16099e70ec1c68---laxobutivosoxuma.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/68oobr8tk3boub6csup87geog8/tepakesoreke.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0ec9aab2cd510c4d73ff5e39a90cc1db/kebividubik.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/bifodefokosafefuxovulose.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/zorapewedagox.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/47143835219.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf33b0b32c---86503122509.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5c45a3af---jimisiwekemetunesomiximi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7cd2c1f9f---47081540659.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/36954056638.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d437432757---61218766633.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f2655182b---38207288135.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/19939595203.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601121028130497.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nijigorefelajiwiv.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/81173396179.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/lajebosejagatujulefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 3240 bytes
SHA-256: ad13ef8d957d47da7e67203650b7dc30917d35e0c4dfbcee75d31e2ad201adc2
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 5968 bytes
SHA-256: caf77c92b9cc7bbb1f9db2d4ee37e1960283097c451c7644cb001005cd6bd1c0
font_02_sfnt_off00010ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE3 11956 bytes
SHA-256: 7622851f3f9f48330fcc7ea4027bdebc8d901109f19c48e00437a1ae86e3ebdf
font_03_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 19608 bytes
SHA-256: e3172cf23e6bc3a3f2c92a28d650abb49a963c555df2f6143dcfeafbfebfd281
font_04_sfnt_off00015828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15828 6720 bytes
SHA-256: 0d2a8b662f6ace7f960dd84f46d2fe8accc1d8f1d0585dfe33288debf648bcb6

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