Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9979d031f74283…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 15:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe1715b5ecb90ccb263c54beb604392b SHA-1: 97dd9232caa7678220c66447a0beb255bbb697cb SHA-256: 1c9979d031f74283ff36b1e387780b48b6275c60de2a927a6f7b1ad1279287a1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. It directs users to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to lure victims to malicious content or phishing pages. The presence of multiple external URIs and link farm indicators strongly points to a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ac32212d0092681324dcd22ba3cd91dd/57953176846.pdf In PDF document text
    • http://pizzeriadevita.it/userfiles/files/jutaxikegazod.pdfIn PDF document text
    • http://balone.net/_upload/file///91593725601.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c5e5cc5e---fafawezaworedisidumoge.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4c54947000dde12da9fe9da47299eec7/4967103553.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xizofujenodipidened.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/fimawusimufonitajeduku.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/40972346671.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a647e52cfe8f95bf59b2eb427bc61749/1559831358.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a67b41294e8a9f83589d1b10334d7f12/rasewawapediko.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210627_9DD11DC05AB97F48.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/35505050761.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/73639469948.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf06000c1c4---lukemarawupafewakobop.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/77357744498.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/56884008197.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2a5dcdc462c47d610813889d4896166f/85024236318.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/motuvojebozegekogoz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa25f2131b---75371472866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=market+leader+3rd+edition+elementary+practice+file+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FF 10984 bytes
SHA-256: ec4193623c7e2bf76f009c62265cdc0353493ee038c89334bc7856accc83f32c
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 22980 bytes
SHA-256: fa9fb240bdd10b12527af25374e5d628b927eac816ad25e4e453395cc21770b4
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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