Malicious PDF — malware analysis report

Static analysis result for SHA-256 192a93871449d733…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 03:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66af5608ca8c769967ab6557a1aaea78 SHA-1: 48848aeac3346514a4d733d6d6dadffa24800c44 SHA-256: 192a93871449d7331d27140277ec802c6c2fc2f6428435112625561fcc016cf5
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://pistant.ru/uplcv?utm_term=android+mvvm+sample
    • http://hnspkjx.com/d/files/nexujemugebonoxifizavav.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f833fb8be68---97820518894.pdf
    • http://usagimatur.com/files/others/23058543650.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095a1a6626c4---72454039469.pdf
    • http://ozkayalarlojistik.com/userfiles/file/mokerome.pdf
    • http://studiotecnicobergamaschi.it/userfiles/files/pijonupir.pdf
    • https://alate.org/admin/fckeditor/editorfile/lunuzovalikebow.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d39e6f430---gegilusonitex.pdf
    • https://cgeminfos.ma/upload/file/39083587123.pdf
    • http://www.520amis.com/upload/files/2174021614.pdf
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/45668046274.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/addee8fbc68d2490777a34aed0e5685f/86863841509.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b0be99c6a5---84886306207.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/02740c2d93c987ce19ff4f94a32300f1/lusozujodisipixamudusip.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qg10is7lrhceqf30agvu2delm7/26797666165.pdf
    • http://www.tobywells.org/media/fckdir/file/satusi.pdf
    • http://garantc.ru/userfiles/file/64602869177.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8d0c311decc2467b84cfada1b7986d48/xizizasedidazisolelabefok.pdf
    • http://artecgroupservices.com/imagenes/file/zididinaxuzovet.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c88c7062013a4b5ddb67c613bd616601/misimomepesufusob.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c488f629e7bdf5a41ec708ca57cff83d/vagofotovevip.pdf
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/38157912350.pdf
    • http://anquocrealty.com/uploads/image/files/42135410422.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3b6a162c3febcf6f8106922695124373/midakulu.pdf
    • https://benhgout.net/uploads/Files/file/jinogigejabusa.pdf
    • http://one9five.com/userfiles/files/puvutikegevemefemex.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/24740757058.pdf
    • 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_off0000d395.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 16792 bytes
font_01_sfnt_off0000eba7.bin
908f612c8b6b1cf2805f6ee8108a4bad71e1e265332ddc8423c0d9ef2b997a48
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 18092 bytes
font_02_sfnt_off00011b53.bin
e0b52e0479654c3de3310bc6a4b9944ce3aeb5c1b2bacff36d65be062b72e637
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 10500 bytes