Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d208a380cf9f0c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 02:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d33c6bcf3d0bffc264093e8e451d6c8 SHA-1: d95e7cabc1918b395b533267a723021b63e42666 SHA-256: b1d208a380cf9f0c25eb2cd239e3f565ea88093311c9c0bac0a331095316a438
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kelvista.lt/images/files/90103796244.pdf In PDF document text
    • http://szzxwx.com/Upload/Upload/file/20215291427179415.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/5103833264.pdfIn PDF document text
    • https://defi128.com/userfiles/files/taselubo.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rixivevejapipemateginebe.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdd498c34---xegomopozow.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a154277c0c---jetubi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c520779a1---91901466520.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/49236485491.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/80014466710.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zixatigisas.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083350263a1c---rivibifoze.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/kaganarenipidox.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/62133240257.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d8570e5---mifukutuzazik.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/60992857887.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/deferomeponuluzunevi.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/59942597712.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/75676495084.pdfIn PDF document text
    • http://www.toptehnik.si/images/2139769435.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161192f179362e---pokotagudaje.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/6401503499.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/3116648783.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0d5d254a---gineb.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609374fba104d---61073223593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+applied+mathematics+pdfPDF 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_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10936 bytes
SHA-256: 7dbee6f7923b019812d436652914a4b640ad92ecf6fec3a9331a57738906c121
font_01_sfnt_off0000febf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 17648 bytes
SHA-256: fb817e31ecc88731b97b41efcaa5c37eb1022617c7e05cea124bd68e0f1be172
font_02_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1