Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab82c2c5c26ad7c…

MALICIOUS

PDF

86.1 KB Created: 2021-08-15 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3392b929425f04448f5b59a95db9005 SHA-1: 7e53f0a6da742d508993ce8a6d754aa42dc8da7e SHA-256: 3ab82c2c5c26ad7c5ebbcdbaa813c5be3a4dd267324ac6350b277668a56e5491
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs and the PDF structure suggest an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a2e3ccfb---fasazatejudexile.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076db9592bf3---86491052210.pdf
    • http://allamericannursing.com/userfiles/file/moreranawasamuregedak.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8c07d49f20fad39b78681588b7307692/84796687125.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e37cde04e---xakafobekovexi.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ee9e81fa8ce650b01e8082b2ed010dc4/kexemusuv.pdf
    • http://tpdw.pl/userfiles/file/76385381860.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/60vn5mdtamcsqiechlopgvehqg/kejusag.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kln7rf5hnllk7imj2homun7i5h/57928260403.pdf
    • http://alexhofford.com/temp/files/file/mowuvifasuzunepewupilupa.pdf
    • http://firewheels.pe/userfiles/file/18838277340.pdf
    • http://cassotech.nl/site/data/ws/files/48512596856.pdf
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/sasezekorozet.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a358c38a4c5---60774523563.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6732aaccd9---zunukagozifinaviw.pdf
    • http://www.hon-ro.hu/userfiles/files/87505543380.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8041383365---82373288217.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4564a3e6---54708363833.pdf
    • http://lyzebrno.cz/userfiles/file/wokasanodoris.pdf
    • http://sugarfree-gelato.com/upload/file/zavowivelosewopulorobog.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/31553005410.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/805c0e934a4122c3f790b2154ebdd298/pulavenilixejop.pdf
    • http://saltokisport.com/uploads/files/murewakoze.pdf
    • http://booklandbooks.com/userfiles/file/nevisipuxugiromisi.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/28284751687.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=word+problems+involving+systems+of+linear+equations+worksheet
    • 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_off0000e6e1.bin
9ff55b6e0764098c5380150330c46b6bf815f44a94d4fdf565b1c34b35444335
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 17348 bytes
font_01_sfnt_off00011471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
font_02_sfnt_off00012c88.bin
d4dc172ccb214ec8a44b714dd6f4c31c419e15cde1f2a557e13e0f30133a36f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 11680 bytes