Malicious PDF — malware analysis report

Static analysis result for SHA-256 b245093a8b3d354a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-01 07:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 565637cc3ea83532f5a380f73c4a1e24 SHA-1: 54a3e56618f0bdc95ff128ffc775919ba3547ca3 SHA-256: b245093a8b3d354a287c53b5434f8b54ca0dab66d00635bc83ed3194f5d5a724
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chataphan.com/file_media/file_image/file/dexalojexoxulo.pdf In PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/fijajaduteturufano.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zixox.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/xikodu.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/fepejujujalomezovu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608323967f233---tudezavotuzi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607136c4277f9---foxiz.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/65376517512.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/kojixafoneleditametaluj.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tekazoboraluvo.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/pubebamos.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/vudadexadasutifamon.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/jenadaxa.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/s0dp168cj9gtkcqhqgs6hm35t2/derisexezo.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/pefuxuwe.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/gikoroxipadekusabanitezek.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/80540461005.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/612cc19f270d4.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/62434012486.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16125f8693439a---wasubevawedemi.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/56457349360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=most+of+the+body%27s+potassium+is+found+in+thePDF 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_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 15400 bytes
SHA-256: 6722fd2b709766e2b326c03679a66c178d5cee32a58553a672bc78af6cb3b57a
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 10996 bytes
SHA-256: 0414502336e7cc1072fe1944b62640b7e772fc6bee8523daeaf5db8ca12fce2b
font_02_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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