Malicious PDF — malware analysis report

Static analysis result for SHA-256 a767f9b7509ba1f3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-17 01:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a3fec5713c696e60d1c8adc0c5434ae SHA-1: cc97d82714b01205a06aefa3e8ec5854ce191c70 SHA-256: a767f9b7509ba1f3d7b3a72beab12b4eada3de61b0d29034d919f5920558d9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://skncn.com/u/files/remasazeroboxajopefamofab.pdf In PDF document text
    • http://www.drivingschool-brno.cz/files/files/pexalifowisugisixu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32f6b500e---vaxodivupof.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3s3khfu9bkc9fj1a15ranphft0/53215141799.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/97dcdfa93cd3583fe781bc95268e2e93/14982343990.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105100429.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/63431815782.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kopabokopajev.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/62965730130.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/81366774547.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e893bcf7b1---60582316835.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770f2f20b8f---59089556957.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/35293703868.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed726829c9---wanomate.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b61c4d66ca9---xopiwo.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/mamopudode.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/xorofupigixol.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/bafeluf.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/49587774653.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e01bf39c2---5659779651.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aece9ea836---56362669752.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/22571165800.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/rilatibepudu.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/fidodozefisedej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=can+roundworms+kill+youPDF 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_off0000ee7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7B 10604 bytes
SHA-256: 435c57d6a1c5ccebb0d50a86cb318a49be52d5b613f8c74480d03186065d29ef
font_01_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16860 bytes
SHA-256: fa679799ecb12b98608b3d592e4a0faf1a45a58d1587927a4539caef3a388930

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