Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95412149a1597f4…

MALICIOUS

PDF

86.5 KB Created: 2021-08-13 23:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e67302cb1f64528e355ee786f3a2109c SHA-1: f459c67e443d373c868e3d783877fda752b531a5 SHA-256: b95412149a1597f4d2fc33c7013b92cfe20040c5800cc7ad3a2cc1cf235b5c91
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://bijverhoeven.nl/uploads/files/xamajalojefejogaxekuxoje.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836ffc8647---zunofufi.pdf
    • http://jjw-led.com/userfiles/file/84207375054.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609308d0c6be5---kixefanunevumuvagikegase.pdf
    • http://c-six.it/userfiles/files/70501783996.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0658aff33---14707019686.pdf
    • http://baraanduliaptti.org/userfiles/file/98377254319.pdf
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/74055859665.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/08a1878f25dfc9901ac89d36bf2516b1/89490402233.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f093ee9ffa---roratipo.pdf
    • http://esipro.fr/userfiles/file/wokixa.pdf
    • http://anhbanglaw.com/userfiles/file/57923985595.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f560b293e00af87263995a610942acf6/67270498591.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944929a42fd---sokizituxutipagoreka.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076b62f5661e---wolowuvudonuxub.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/jegibefakosuvisiro.pdf
    • https://eyetracking.pl/userfiles/file/dekesonejoxapiw.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c709c8b30a7f29bd0523a22753291881/93844329814.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/8167910739.pdf
    • http://allprintusa.com/admin/images/file/60249394783.pdf
    • https://shoreluxurylimos.com/userfiles/files/zafofuru.pdf
    • https://perfecthospital.org/FCKeditor/file/68874549809.pdf
    • https://alohasafaris.com/files/xunixorokurenelegelasepo.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2c59b299936b119149f2a59920f12cb8/jiwisugarob.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/4620802378.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+track+the+lost+phone+with+imei+number
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
font_01_sfnt_off000106d5.bin
332f45d4d76549157081cd037c216d002daac1f7f8bdfc7192eb3ffb366d8c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 11048 bytes
font_02_sfnt_off0001202b.bin
656fa6b5335a4d81cecf49931ddd99f28d6fd9bc7da95e29bc3917154bcd7065
pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16952 bytes