Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c31d880c2fd10fb…

MALICIOUS

PDF

75.2 KB Created: 2021-06-29 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 53e18bfb8f16b0818098632ba12f7a9d SHA-1: 19f8b50c53fb3f38dbfe8f02aa925d6486084aba SHA-256: 2c31d880c2fd10fb74bfc4b40dd3401d8d0feb6ddcffe120ab39fa6f7d0098dd
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, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ad43ccdff7cac965b6a17253e0a36389/46362613514.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8cd7481c---99824750264.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/979649e6594bce19afb0068d10ffeca6/gunemazozemen.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-28/20210628132930575042.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210624001930.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/32a0950b821f261db19171f69dda1c76/63304687156.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/81667baa73adcfafba00ed22fe8754b8/ratib.pdfIn PDF document text
    • https://rendiamovisibiliglinvisibili.org/file/75567099404.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4c96c747---68820700303.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4142d52547---penibatobuw.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rokozujofo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5ff3cdc72f73d659899dce713e5e51f7/86655662295.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2b6efdbb---xiwopowulixodow.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/pn9l0k59hoe6sikqaclm78a800/werejapaxinamewu.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/36147451388.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3slk1gcovl5cjo75t0n8t3760r/10733874414.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zewibawafox.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pabarinejime.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/90624203899.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/lisuzixivat.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/1450866863.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9d650c3c6985496f351beb827d249ebd/43876365709.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64737c24fc---18041044406.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/getopebufupudowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+stock+market+downPDF 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_off0000c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10640 bytes
SHA-256: 114de02e1095dab353803aa421980c881846baec1ea18a802e6d5eed85b503d6
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 16828 bytes
SHA-256: 72e37e508b3ab31c3b5e5ee2d2334a82e44ca417f2dc20d11dce617628222025