Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79397ff5a9f2f2d…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 17:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 544d5cd8c297bfc0409b768a38e3209b SHA-1: c5f02c5185f3cc85508c372c4c1fa0fb326c5e23 SHA-256: b79397ff5a9f2f2d5024beb19230331ceded57b563af64c31627c13ab27accd8
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to numerous external websites hosted on potentially compromised or disposable domains. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2680

Heuristics 5

  • 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
  • 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://bettynblue.com/upload/fck_img/20210728/file/gofederutasifedute.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdd1f0978---43814414729.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rc4md87220vuk60o19b0p1mro6/juvitix.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798459623e6---xokigepedi.pdfIn PDF document text
    • https://adikketiga.com/contents//files/loxaxofowe.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/nutemirut.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/06ca53a99f124e927e60c37d53e0f4bb/bekewigumoxutufa.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6383961150---guzifemabalasusefesiteka.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/76908334992.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/3922481579.pdfIn PDF document text
    • https://cncunse.com/d/files/dadikanolegegus.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0fd65463---vikevuxajewolaso.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/newevu.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7c16a71dfda2aef5dffadff128a4e20c/pixunoradadolobepawinaxax.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c1eda4d6---31956816825.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/puzisigizelusemo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/16124899844.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160add7d7be246---dirab.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f8eeb73a53afeac8f55f60b41afa2d5b/finojipexi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea232907b0---31571095881.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jesuxikokojulakelesowipe.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///43559544700.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/61507301451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=overeaters+anonymous+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 18716 bytes
SHA-256: 9dd3c0f8e879a04283bf1bc468b13298cc38db9ae08293d5815039641bbed268

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