Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e06c59c0d10d7f…

MALICIOUS

PDF

108.2 KB Created: 2021-07-22 11:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d940565428ba65410c65ff8272a9e32 SHA-1: 326da049409d5565f7dd39c55cfbe00e6c300a16 SHA-256: a4e06c59c0d10d7f2225e3999109b5b79744d8751d2c4118cb5b991ee8db867f
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains numerous embedded URLs. Several heuristics indicate that the PDF functions as a link farm, pointing to external PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests a phishing or malware distribution scheme where the user is lured to click on links that lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4787

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 https://afayl.com/userfiles/file/4736560275.pdf In PDF document text
    • http://fullx.net/files/79206954465.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da02e4ab8---julojamodoluveke.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6bfj4m5jbm5tdnu04pjigr73dn/14139847657.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99adea086---2854935658.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77e9d2a90b---derofumazirizali.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34505ebb6---ninezaw.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eca7abdeb---48991595271.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fetategivebulogajel.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8164d0ca---saworuwivufiluwaw.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/daxanamulotagopopoboruwum.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ab3c1272c---92388694014.pdfIn PDF document text
    • http://zae.me/datafiles/file/felekuxixovezakiriruw.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a90413e20f5efbe425cff7927c8acd4d/padafuwopeda.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zupig.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9sgincpgos7b27034dsiql99fk/49806432614.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03ec3b750---13180385865.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/478c7b939d1275326e90c48138956484/94406922043.pdfIn PDF document text
    • http://uamarkets.com/images/file/26391275502.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/579d7755b92e31207a0a2ddf2c62a5a5/gaximorovatenutas.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5d060e56e3f84bd695fc03252cc23ece/35492332825.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/jepupenin.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eee204f90---59055325620.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/mesovelizu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c89480a91---64341435489.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a7d9549958a289342c719bb0d7a0b51d/48944559088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rainy+day+poem+in+englishPDF 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_off00016052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16052 18268 bytes
SHA-256: 2fabbceff1b63be2b3b43c65344031f0c18f61db041bddf070685d1747326edf
font_01_sfnt_off00018f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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