Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca36d71963d7b9c3…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 10:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9109ddf4a6a18a0d9d23852352ec2fb4 SHA-1: 9fb87b4db583c9ce7fefad9457b112c43b37ee75 SHA-256: ca36d71963d7b9c3ef97b923cc42289d20cb1a30f4fdf797a451d3ef5401c870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the links and the detection indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.annaleehuber.com/content_files/file/25823320139.pdf
    • https://accuratesearch.com/userfiles/file/32238181586.pdf
    • https://pet-fashion.ro/mm/file/50337283051.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/f3plgaio3ej98rvvuq74l2r5up/54425635514.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c020eb75---zobonulonidopofavomizole.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0b93a761---41811788320.pdf
    • http://arslanemlak.come/file/mojubuzizirusefijex.pdf
    • http://novussiteyonetimi.com/uploads/file/94554628386.pdf
    • https://balajitutorial.com/admin/userfiles/file/bigabemebivoferezefub.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb62c2cce---89397043772.pdf
    • http://stardentalcare.org/userfiles/file/tixiwosikonelisat.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c910bd34391---253348399.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a80856f24bc---72404006756.pdf
    • http://blackivy.pl/userfiles/file/ruvesozaviva.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609474afe41ff---nigoboki.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/le6n36pjl0es9pkl02qlcpc8h8/xefepimajix.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/webowisalobi.pdf
    • http://thaoduocvn.com/userfiles/image/file/zopalupewezafojumef.pdf
    • http://vmkmsz.hu/userfiles/file/lepiviwufagon.pdf
    • https://apskarota.org/userfiles/file/pekunijopuredegezap.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/wusuruvasedewejilotuvi.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/kqvlvugv3m5p9p8ddsijanabs0/81612196291.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=essay+on+importance+of+time
    • 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_off0000efc0.bin
1f1af7b306fcb6f3e3fc142145b28a4080f84fa74f87299e5766ffab6136fb55
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16796 bytes
font_01_sfnt_off00011b63.bin
fd37357dc81a1302edacf970e5a1f89e35466f800414b96236867fe1e274569f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 10692 bytes
font_02_sfnt_off000133f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 16792 bytes