Malicious PDF — malware analysis report

Static analysis result for SHA-256 b379da8120d5db06…

MALICIOUS

PDF

81.2 KB Created: 2021-08-25 16:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d578aab2b8a9dbf148a1bb02283e98f SHA-1: 8efbb82dca14873caa4aa5fe5de582b8c6464380 SHA-256: b379da8120d5db0660e76458eaec2343e4e9e6167c0911f5e83be03f3c61eba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pistant.ru/uplcv?utm_term=is+have+a+verb PDF link annotation
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/47970624933.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f27d5ccc1e2---larum.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085903f92bb2---jaterofomu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3e5f7e9c01bfb0f8b2bd6a29db759073/15404981849.pdfIn PDF document text
    • http://imbirimbir.ru/files/43760218924.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09bf47d079---18989454571.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/43257056706.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a3b5e50d---mofibuva.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/64d2ad99074b0b8157b0bfdbedf3e425/basurinubowolifapejunuri.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/11347891551.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/96058057505.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9qshj7l6iikh3itnmp7bc7fm5b/49807794060.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/43102448469.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2e39fddd9ebd5e25d3aeeb506e7d993d/62765695786.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94597664292.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/damigosuza.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/015dd8902e42b2cd53a8992b13ffa365/6126464837.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/lunekovureberikikejozuv.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707b689f16e---16141875091.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/zurebosakuvenupiliwe.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef7fabdad7---tigevuvigapisuru.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/zarebajitif.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 16728 bytes
SHA-256: 78164bf5a0a80e3743782535a368fd61d62583ab26abf4d875a307d69653a66c
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 9904 bytes
SHA-256: 179123a4e593621938ce3a0eeb4aca58dbd5f2693b467bcef200230a53ec9a3e

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