Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deea851fe275118…

MALICIOUS

PDF

62.3 KB Created: 2021-09-26 10:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40b5db29adb61f9504233c99b3537802 SHA-1: 123ea06fe5a33f8ed8ebbf05c3ec88c0baa554d6 SHA-256: 4deea851fe275118f085e333674debae6b5253e3a6b59ee2102f3daec2e47eee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of these links suggests an attempt to redirect users to phishing sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5364

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://ketchas.ru/uplcv?utm_term=iemu+apk+download PDF link annotation
    • http://xhslsh.gdx.cn/ckfinder/userfiles/files/84066575391.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16133a92fc64a3---84182146317.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614033974d141---39130635712.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/jewevomesafejivuke.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/togorikejuva.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/8644841507.pdfIn PDF document text
    • http://quetthe.com/upload/files/wasatubemif.pdfIn PDF document text
    • http://polkovnik.su/upload/file/95465538405.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31673153295.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/54795198202.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/62697427831.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/55614542824.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210922151319.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/duzatapeta.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/37972979717.pdfIn PDF document text
    • http://imoroz.by/upload/file/tudotemanevakabarilal.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143323b27035---97080324534.pdfIn PDF document text
    • https://abss.pt/userfiles/file/busunepudox.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258dc06060---nanupuzegovebadilibumase.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/luxawizimimelobo.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/vesatalaro.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/dopisagopewobokazoxi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/pipagovesalufapevapubetoj.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/4258713940.pdfIn PDF document text
    • http://a899.net/userfiles/file/tiwil.pdfIn PDF document text
    • 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 10324 bytes
SHA-256: a19e3b47778a0443008a9cf6f262af6d86f422f041491cf73f9dde67a985743e
font_01_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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