Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1b0374c02400a6…

MALICIOUS

PDF

66.4 KB Created: 2021-09-04 16:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1a387c85b8b31633f7b262c8b9e5b05 SHA-1: 9cfe835f19fdc210fb364a9089f69f5437c04969 SHA-256: 3b1b0374c02400a637675ae5f63d9f86e00efde09dacfc6f424d4477fc8c312f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7727

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miraesusan.com/ckupload/files/7733124865.pdf In PDF document text
    • http://teplorium.su/userfiles/file/xuziwobofosudokefexowut.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/betapugisojupugebawipegon.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87d105e12fef509418fe3864fb97ca61/lufuk.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3cu12cclnadb7jujj3m7kn54ff/buxozorenukawujabifole.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210816_7686004B08609EDE.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d19271e174---61990431018.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/jafitubalav.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/01bbff59e3437ab07b57dee2ef61b442/zijenitaf.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/82047471302.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c0fbe6082c227a20f10c7982b9307e61/fazojavolexokumimogafosu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160760f68a4f92---85455374307.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b6c87bf8fa1eaee88a438235ff4b34b4/xosofatuxasab.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/migupevovozej.pdfIn PDF document text
    • http://stl-hk.net/userfiles/28472027766.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/nexogiwezedibefunimuzaja.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/lodirularo.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/83572406411.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e558c56c8c---9460788461.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b2da36f3---77735369696.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2efeda29---lugimenijidof.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/37989309879.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/34196109294.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/t03h5llqhe5op4jgnkq65dp99d/kanosukawadoxogijewewori.pdfIn PDF document text
    • http://kodemari.info/data/files/furojusisogosabebekupod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=scrappy+little+nobody+pdf+espa%C3%B1olPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 18820 bytes
SHA-256: b6349395119a75e033646defbb611b428a8d0ac96e9eb2e4a0bac92ff6b903e9