Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ffad7bc4e39825…

MALICIOUS

PDF

86.7 KB Created: 2021-07-31 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8605355a10b99b1f46ad4ebef3038adf SHA-1: 52fe31c5cc497e6c5d1947d974321c4a6ca66b6a SHA-256: f9ffad7bc4e39825346917e8bf0b666045008ca3cb3125c70df71f663c2e74c0
204 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document attempts to trick users into executing commands, likely to download and run a secondary payload. The presence of multiple PDF links pointing to external resources, some hosted on compromised CMS uploads, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://joinvita.com/neu/userfiles/file/62682232414.pdf In PDF document text
    • https://yepsell.com/userfiles/files/5952498425.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4774a47cd17c1aae2e5a0b5cf23ac95b/50187315959.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0534009e---tafavuruxusekuxamep.pdfIn PDF document text
    • http://614move.com/clients/4890/File/sarogukizomunikefu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2d6b7072---2762482823.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/podoxejilomite.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee6b45e24---mefemosoz.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rijunizekomoguwuvirow.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpkebkttdml0s2jn63caqn0kgt/vefotatir.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/vetutidok.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/64572715207.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/fotufikigovidod.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/duvigovalan.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c6a82f81---48964228910.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/eg9m49rq54vt8m3engolj7m3o3/korugegenuburijajeletax.pdfIn PDF document text
    • https://marigabung.com/contents//files/kubulikewolu.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/87157509949.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/serilunibexar.pdfIn PDF document text
    • http://webursitet.org/Files/file/37958041563.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/81914875175.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/gobibagapabobusu.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210714063102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+fix+lg+washer+oe+errorPDF 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_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 16696 bytes
SHA-256: 7f06a3639c3f3a9ae944d75ed089d7adf192718c638dcb0546c147bca6aa67df
font_02_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 10568 bytes
SHA-256: 928950f526e82c8a38b532472f2487b3a54f7b1b1b37d28d4d0c8a839807ba87

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