Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e13ca4ccb14ee7d…

MALICIOUS

PDF

100.4 KB Created: 2021-06-27 03:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 40a5f9b65282dd0e53f1887d42c6939a SHA-1: 184d781988eca010cd59962237101c08e6c1b30f SHA-256: 8e13ca4ccb14ee7df2de1e7db778e653278ed58785b79dad8613afc71b423827
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb680d691---rexerusazodorome.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/c7vh16uvnhfhqgeuilcftq0cn2/59233876007.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792f2ab06a3---78016133605.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0710ec90---57810871785.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160823c9e3b860---97243103698.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6rlnni5po3f284foikdiolhqfc/16054935074.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/83ea481087f5aa40bb88c8512808f485/75841825087.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/93674269154.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/kc5qfu3opg1rvdncv1l7v6456v/sorizovugokuninekulag.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cbec43090---38545361395.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/noruxufekimegukoxukutopa.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/43649845830.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/jamugutufelewiwaxikamu.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/vogadefeguver.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077c206dd9c3---33124508302.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b866f321633---54819238109.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607014e0a2acc---xadajiro.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/11596677623.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4907904e6---7519059425.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/43ffee686dda1efdff4f7999eadbb122/61475467498.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/7ogb6tuagtql4ro26i1i2ptmvb/vetufurijidakuroz.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21a531fcb---guzetovijemugidubatow.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21d8d368b---tixupagulisuromup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=figure+out+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001626e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1626E 19016 bytes
SHA-256: 79a12ac9a03d8d88b1a516e4e51b72fae1857ba03f1fdb8b65c26694797da7db
font_00_sfnt_off0000e99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99E 24152 bytes
SHA-256: d7f8bbba01d62c7502ea6b192aed5025f966388aef669183ae6ef59176823774
font_01_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10312 bytes
SHA-256: d3473665a39f9df5dd5a94bf1163ed28f90f859717bc65b96624edb132ff101b
font_02_sfnt_off00013b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2F 4072 bytes
SHA-256: d2bb1de6f57bab116e8b4c47ff9cc9dcdc7f6fbc5bf4b814ee75921e0d63f28c
font_03_sfnt_off00014a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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