Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba45cb3ea19f229e…

MALICIOUS

PDF

84.0 KB Created: 2021-08-28 21:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 269c5d230c11f768d7057924192a23aa SHA-1: bab2caf18492e04ed606a090086212a43904c394 SHA-256: ba45cb3ea19f229ef2eff65edc24b5031b78e2d005c097a6efe89ab3eca1c87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially exploiting embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fkeptmb8o7i8fi2do5l101hati/vimusobilixer.pdf In PDF document text
    • http://odontoflash.eu/userfiles/files/kaginatufaxefewojovifek.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bb85af4db78b3941b02b20bb4285d261/vonufazivi.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/nofen.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/22gfci2e7nc52is79ipea6icqp/tipukom.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/79tjtne7qm22r3q4h5cmfpcjq2/gofowapuzadutudezebuk.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0bdff807e7ee1e60f080c6d16306c4b2/xusakoluxe.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55dc10e7cb---12763337876.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/lavuzifofulof.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/25648118063.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021072001003345.pdfIn PDF document text
    • http://kleiberit.ru/files/file/8552641177.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/godunuwabitilujafojig.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1cc3b4d7f---61558763699.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/lokaxu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af50f80d689---vibexagevijanevofajo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jomaz.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2f638a4ba7d2d2d87ff907847ca0fa5c/jelijanodizasixutapev.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/29470989910.pdfIn PDF document text
    • https://plasy.com/uploads/file/fivesikemeluta.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/67117295742.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2bba1d8b0---28876153302.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/66722838653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=css+change+size+of+imagePDF 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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 17808 bytes
SHA-256: 22edc798a0b4a3ff5bf5afe45b511f5684fab995d5d35844b9412373a28a85ef
font_01_sfnt_off00011170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 10628 bytes
SHA-256: 090f0a5180c61558f5dba29aeb9d04bb0d1513b0f7ff157b9f161e2f0ba5fa7d
font_02_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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