Malicious PDF — malware analysis report

Static analysis result for SHA-256 8596d19f7d75a123…

MALICIOUS

PDF

140.8 KB Created: 2021-07-26 12:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e90258a5e5e0ee885e4c17c30051bdda SHA-1: d75275bce36d927b4e6feb0e080c017ca458c508 SHA-256: 8596d19f7d75a123aafe9f4717a6fb88406ffeef3158a5f0a81ca772c4e909eb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites with formcraft or super-forms plugins, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/53l1jd5mbgqhdprf7qb8ub90d2/rifapupekopigiki.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74fbbed88---18301888090.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9b1a5410---94490570355.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/80958422219.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/37816129958.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/tobupijukalo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/wobulefajawiwetonibekoma.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be021afe4e---lopasizu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/7kgr0psofvp87eu4oir2bki7m5/66593482252.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070247646bf6---53550758175.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d70100aa7---71875283091.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa12e8422---56757631868.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/fatobedanu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9f441a16---9896104826.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097882997f76---52278183636.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8495b1321---72244974030.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/22414554309.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o45puo3l6irkau396n80q049l5/48579023328.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210726065825_568349522.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/vaduzivuf.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/siduwanewezidokesowa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/00c89e0786431b6395c5d5bcec9816a5/begak.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210708112146.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/fqohnvbod9lpt6fhpdg53abclc/nozujisutuxetejajafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=harry+potter+and+the+half+blood+prince+synopsis+moviePDF 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_off0001c417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C417 18104 bytes
SHA-256: dac28fd4e0c2d2cdebd57b2bccbf6d481b3b58ee1f4c521a5b8263fdbffb1546
font_01_sfnt_off0001f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F334 11196 bytes
SHA-256: 14f7ef3675db184fa83da7d0a6e3d6978cee02afcae7888b2e22e08d577e4ebd
font_02_sfnt_off00020cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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