Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf044b317a2deb2a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 207d001209a7f3805959a5f58e51c71c SHA-1: a91176deda1db110302e8cf6abd0873e93e92220 SHA-256: bf044b317a2deb2af0994b7e1e389ffe409e1c4d0e48a078bce1cdcd03e11f42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=mary+did+you+know+sheet+music+satb+pdf PDF link annotation
    • http://parentini.it/userfiles/files/wakuzolew.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jarumogepimapobuz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f697921c0b---tewedisezevumitawutop.pdfIn PDF document text
    • http://brlairport.com/images/file/91043118784.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d5ca0cd3b2c7046f55159ca24b256b74/nisuxagegijito.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rq02s7h0k0oo5mr5j3dr8r0uh4/55597627403.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abad72f329f---96259047721.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b182f86d5c745b2bbe6e019d12d359bb/peburokekibasobubib.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/30388491405.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/57d4aed1e57973181d24b0caa49a8bd8/tonudatixu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2o2dopre546e69qoba84u4q2hd/lupadesivotabigevum.pdfIn PDF document text
    • http://inphilong.com/upload/files/89544676554.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/visisixikofifej.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990ab73358f---wijurugadi.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/77191676957.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xerasevudenugobuwerokukow.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jguint111al7logm85pjjori9p/mujisoratoramunex.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/59610679135.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/ludolafu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/patupifukix.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/67864321126.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/58889195676.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/xewesef.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/074f412937dee958af387023642bbfb4/3942209341.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132a612dd875---83785523543.pdfIn PDF document text
    • 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_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 17376 bytes
SHA-256: 9c9778a58a718c3661ae938e8935df2ef09af422f87d8e459c2c447eedf5e356
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 11364 bytes
SHA-256: a7083b1e13c584774a114762fdf349fbb81e15971f6f9f836a19b275e78db1ab
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1