Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcd3c2cff5225b0…

MALICIOUS

PDF

91.8 KB Created: 2021-07-16 20:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ed4b3aab8a37594a8314ca45d593c58 SHA-1: 00e29b385d645dea18b615a05d84dec079d9f942 SHA-256: ffcd3c2cff5225b0435c894c0864f384562eadf3df4c989185747e611c5921ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed to redirect users. The PDF's structure and the presence of multiple external URIs suggest it's intended to lead users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94ca53acd---27093515172.pdf In PDF document text
    • https://harkakotony.hu/UserFiles/file/wepupuwabaviralogawifa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/474gjh9a3dd7t2o3ocm9utr4ja/zubilixupiliwajadolawiso.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/lidekukawitozux.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/likuvoxatulaja.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2fb0273736c76f5563c8545cac2ef597/15724943141.pdfIn PDF document text
    • https://agatanorek.com/files/file/67470067334.pdfIn PDF document text
    • https://zold-kommando.hu/files/9201412719.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/32966807832.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/404075a1857b7e16a44c42af7d0595d3/89876184259.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/46563597802.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ah3927u9o22t2qc31o96ekv0l0/39805578847.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/31264808958.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/aejb3v2dnfebja3mlrcopajed1/rozanatupimozavop.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e1ddb9dd---kagawulinuwaw.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc694c9f1a---kasuzibag.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/905d21e8baf4f3ef77c9daa5bbb4e34e/duzinogemadeso.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/48591734293.pdfIn PDF document text
    • http://epmachine.ru/d/files/40190210000.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/31ae904f205d4695509aa2e1305cdca6/nelodadatabizigikubi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a44f1d706---mamuluzefeselusagezuvi.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/10181989929.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04aaf32ff8---40107283900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+answer+are+you+willing+to+relocatePDF 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_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 17808 bytes
SHA-256: a2459b475bc51d57de792f86fc23f862b47695fe7f1a07485e6f7e85688430b8
font_01_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 10696 bytes
SHA-256: 625723f51697dfc646b7ccae686eca34ac6b20af4276ae0fd5b40177b90a1b23
font_02_sfnt_off000149b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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