Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01e410f3f6ab7e5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 00:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e16c80b563777919b4e7c002710e8459 SHA-1: 72e064e53474eaf72c68946e45a013873a595574 SHA-256: d01e410f3f6ab7e5baf9307c70394d3e6855eb7b6638c70e3a1349b42ee277aa
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. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other hosting locations, likely serving as a distribution point for malware or phishing content. The presence of embedded URLs and the nature of the link farm suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=1mobile+market+lite+apk PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9d71a6067e92dea112bab28f359b96f7/65571541437.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c17d1759465ec25063a690b3b50fd876/gupidoxo.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/16423116957.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5267eb758df2dd9834669ae4549a6930/3802824560.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/41973902600.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/40153590037.pdfIn PDF document text
    • https://securitydm.com/slicice/file/88653940888.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f29576e75---romopuzodo.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/9636177569.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/gokitezisefodezofumiren.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/90797838849.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/lezovepezifaxilidas.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/jurabafelapibikuvaf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc6a75055---8333292487.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c9bf03ab0d022df5d4cde42ba5265023/46740419677.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/kuburerajutifas.pdfIn PDF document text
    • https://tebra.si/userfiles/file/vofalupogadupobagukika.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/muwelegi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc9c46683---73072485659.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/4dn91ifjptrbeqi3luafggbutj/rudojaxudoselinoda.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909185228152897.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/jelawabunub.pdfIn PDF document text
    • http://martonelektro.hu/files/file/mubabum.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/nanonafixidiwuxetu.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 10328 bytes
SHA-256: 8f00763e2515fa3b95fd54e6f89cf474109681de0f10e6b999d696b8ce290ffa
font_01_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 21268 bytes
SHA-256: 1bc96d22826b6d953672ae9e72158c136c15f809f32acf2fa43630d766a2173b
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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