Malicious PDF — malware analysis report

Static analysis result for SHA-256 7317b0af68224973…

MALICIOUS

PDF

87.1 KB Created: 2021-07-07 13:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c3d3c0767d3d472f961c30b29c6b60e SHA-1: 69218f0d8f7a876b77663ce264e72b76e1c636e0 SHA-256: 7317b0af68224973963935a019e01f5f7ef7179330e4584caa0a913137f8b6f4
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting domains. The presence of multiple PDF link farm indicators suggests an attempt to distribute phishing content or malware through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ecohort.com/userfiles/files/falabavuxinelava.pdf In PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/41d7a8daea1e15d3d42b1a93610078cb/27646436764.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3050d5c---64827039702.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/rapizafini.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/17172581718.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/dhgp0es4ksa2vbeecm32rgi7i0/lunikiximekujibukewozug.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/lukaziravumukud.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/81452695340.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dinjsfkapujcslaq4ntcti16qj/70455974316.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f869ef097---23751215368.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/36680149713.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/84e519a4d8eec7e60eb23e1d1a4e13b2/zemepivejefakamej.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edeb8518fd---vidigupekuzabolufolufop.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/widamazuravasukon.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8c31f4a2---57642096730.pdfIn PDF document text
    • http://deauville.ru/files/file/81305982292.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d9d6ee564b4ce24ef97cb0ef40c84c3f/monigefewilifubo.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/numarirusuxiliv.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a20977e0---farojabofixegiza.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/91478882720.pdfIn PDF document text
    • http://waypl.pl/upload/File/budemoge.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pvnfus1sjlabta353cbu543mvo/munurixomi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a753d64a338---1927748368.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/41285735335.pdfIn PDF document text
    • https://85097781.com/upload/files/33839971917.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/41620980257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=rss+feed+aggregator+freePDF 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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 17864 bytes
SHA-256: 9c1928f773ee765a3072a46c5e9bbbcf2d2f44d4fd20fe2cf76e1220c944636e
font_02_sfnt_off000137f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 10332 bytes
SHA-256: f66320045fdaac98ab59aaad7b57039d94c528d9a64c58311e6923813d49e212