Malicious PDF — malware analysis report

Static analysis result for SHA-256 01fb7ecb80d702d7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 12:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe196cc706dde73291a0938ebb0360ab SHA-1: befef359fff344360791d1a1444e7d93a68b232a SHA-256: 01fb7ecb80d702d70566faa5b552304a1a0a7fb7ab7c714517fb3f343c383117
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The primary goal seems to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://f-okinawa.com/img/tmp/files/metamuminem.pdf In PDF document text
    • http://natproperty.com/userfiles/files/82082347605.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9ab5f704---tilejovuvelepinaxolabav.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/16159980384.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/kokamutalaze.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/34117125266.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/29220422066.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/negabesusutodoze.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/a22j7qojiastkrtthfb53roie6/65118196636.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/68412114815.pdfIn PDF document text
    • https://plasy.com/uploads/file/vumixo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f95d6cbedbb---23850722945.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210830_D5AEDBFB7834D04E.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ded6f663f5---gedenuromanojo.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/radobixu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210828172702_966307367.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gutazevixekulexonanoza.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16102f68634b7c---1806512521.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/nqqs4nf0c2v9hfqafmc6e63hnp/36229389158.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb59ba0863---nigenupedojaxari.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad168ba1a7---31196164677.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/xatiwazelinajixakozu.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/16091543320.pdfIn PDF document text
    • http://centrons.com/uploaded/file/852154185612ec01db6397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=netgear+nighthawk+ac1900+model+d7000v2+manualPDF 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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 17848 bytes
SHA-256: b8064021445de456961e6315a4dd5c12a31184271941098b1bbf7fc54e9eb09d
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 11480 bytes
SHA-256: 9d837c1482e26e0fb0bbcf6dec42ebea01426be9e8da24db909ebb038434582f

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