Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e8fb25fc5a9913…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 06:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb8c9b9e0e39754b8f71e58a206120a7 SHA-1: a3afc990592a91deb6f0e93e3e938ac4f7a51d5e SHA-256: 71e8fb25fc5a9913bcf9a59eff9812dd2bad370a2dd3b28c565e63d1d3920177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document functions as a link farm, hosting numerous PDFs on compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/k4bu4s6cn9j8l7gbnqf2g5m8q2/ninuw.pdf In PDF document text
    • http://kotolantopeni.cz/file/gerumozifogirowogegure.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/71422624151.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9c4abf692---nuriw.pdfIn PDF document text
    • https://ovalpolycoats.com/media/tigizofevetegemotuse.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/210b7a67fd9bddfe83a5134deb926b9a/xepaluvatolifijuso.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j2m45frnsap3lba05tot4fdpd2/genimedogekiluja.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/23923276038.pdfIn PDF document text
    • http://mopron.ru/upload/files/meputuwakibokazez.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6009ecc7---45219403380.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/momuvebavuzidom.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/94952657481.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e9c9421f---pobudepetuwu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/jonerelofifobazuz.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f70785b0c---tugaxezedisuj.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3ff374286fcb6df0d4dfc4291cf4ddca/51347294927.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/mabenorad.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/kexiwijesudoperobuxapal.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b83c8033fcb---18279103194.pdfIn PDF document text
    • http://christopherdallo.com/file/45694795736.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/55206235406.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c990eeaaf44---68920621777.pdfIn PDF document text
    • http://freewest.at/46656000411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ehc+slim+jim+electric+flow+boiler+manualPDF 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_off0000bad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 11040 bytes
SHA-256: ddb41fbc7787c94701b26ee1c3a057760abeb4288e37a0a776bb5cab7a7ba416
font_01_sfnt_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16236 bytes
SHA-256: 7ab7eeb8216fd694f08d58593c4d8ef1897bc9db4ccf83109a1f6947e6de8405
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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