Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1f8f28c5e339f5…

MALICIOUS

PDF

67.6 KB Created: 2021-09-16 18:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 721570d84ab623e790764aa1c9502b43 SHA-1: 2ab0897303990e586b484d24e7055ac900ff0ce3 SHA-256: bb1f8f28c5e339f5e89e7e9666f0e5f2cd93065908f46a48ef1bce19a17cb918
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and a compromised CMS upload link indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6055

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://lecachet.fr/docs/files/37207344775.pdf In PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/vezerowexugufuvuripubovog.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/nowuporav.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k2rvsnd6jm0lmj4spulfb305nu/6768469678.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/68557280590.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/tujaludisuxodasede.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/76721420325.pdfIn PDF document text
    • https://isosklo.cz/uploads/78299348483.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614360a0627cc---7784349604.pdfIn PDF document text
    • http://sparkpro.lv/content/file/29099896824.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/subukavamudavasabadoxobes.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/vugelowodaguwiwor.pdfIn PDF document text
    • http://envigest.cz/upload/file/judinixiwabazipixawokuba.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cffd826a71---kijetedagujov.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/85498118678.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/22513781415.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140892186663---wesujikilikurebukiroxuxu.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/wiwixote.pdfIn PDF document text
    • http://precisao.net/files/files/79417181304.pdfIn PDF document text
    • http://flomojapan.com/upload/files/jibarejaruxovujuzopu.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/modupaxafamakilufem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+cas+calculatorPDF 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_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 10312 bytes
SHA-256: 9f1c434762abaca456dd4b675133cfe3e6c6d00c7e5a1e40d130d532e3fb68ab
font_01_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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