Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb01a53e71c7ce3d…

MALICIOUS

PDF

143.1 KB Created: 2021-07-12 22:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 30ad2f58af26126f5774d2dd231b070b SHA-1: 79639a8ee219836590f6cfa956934df654291448 SHA-256: fb01a53e71c7ce3d52224e5349fed4fbee0b3cbecb61ed64db4c531880eb6deb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://drafthe.ru/uplcv?utm_term=herpes+in+english PDF link annotation
    • http://indianspringhomes.com/userfiles/files/4722821768.pdfIn PDF document text
    • http://zuche0551.com/upload/file/87552655513.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210712220204181.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f9ed8e824e4756e393211ba32f56a608/zefariniduvuzidu.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/sojelirewosa.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/21680017529.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3acce7cf---84863531399.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1813f2146---98717998634.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9f77bec8---tepugopigirolix.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2eca2eb0---wazufexakufose.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/rozozalipewube.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788a457f278---pinotewepujuwuxogeruj.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b0374f81---gamivodurumukaripukopedar.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/sujokiguvasuzelewosiloru.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872787cca73---vafuvopeleraseligu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b9f87507---61431000392.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021511157586520.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vr46q9bc2uqe00qulhls5v5075/95390001550.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9981dd667---39260181039.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70112d364b---78775613626.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dabc64cf7---91281414226.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/samavomed.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a001f912331---xiribojifuj.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xivoxiso.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_off0001cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD7A 19424 bytes
SHA-256: 151ba5cf8ce6af1844aa4ca721010a1f2b3eb95325d24462892ba404f99859ce
font_01_sfnt_off0002009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2009B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000218b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218B2 10144 bytes
SHA-256: f653c0d55052e26336190baa2deb6dd5d166a4afcf5e38c8ae85ee80514ae723

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