Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c97a705d35b0928…

MALICIOUS

PDF

92.5 KB Created: 2021-07-22 03:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4512791211a7bf998a47a066c1038281 SHA-1: b8bf4af7696b0428ef9aff1adf488566024c3b6a SHA-256: 5c97a705d35b092854b3be349ca876a30d94ef841d257b11e15788e20f6c485d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30060b06d2---gonijukunipinajajubi.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/zubuperarupoliwuzudewifo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b18f1b9c6---46140886097.pdfIn PDF document text
    • http://fructusartis.com/i/File/58025654312.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kbnvdmmmn9r7u54m1leeeualo5/putegokulufosojiwowelo.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/80133247644.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/11000006770.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/39700930177.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bowixaloravomewerate.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/21942607166.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a139691616a---zemasopema.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9f9a3c6f5---44120680661.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc452f082c8---9098285825.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/10407e0c638f539668ca8eb4085fa7d8/jagevoturenotiwobokaderow.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/80b0e34689373045d6fff926231126bb/87307705561.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/sudugexu.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/80527685294.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/47518074286.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/makokukogiriladebenowit.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/83784368b1562f64b5a029f105812f22/86411857201.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf06460659---14320749216.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/86ca249b0151206c49e2c1cc98ff2d09/maruxakuxotetajelalekix.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fc09e713---26543168679.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddbe0f3176---nalun.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/topamibudimov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=44+sounds+of+english+with+examples+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11799 11116 bytes
SHA-256: 0c72e1283f176a3000a608c04273e1626cd158be43d8400397edf1c6db71b7c2
font_02_sfnt_off00013139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13139 19220 bytes
SHA-256: 641cceea694864819597c8fbd2da5a8b4f5b6edd89d029220ccce9779a0c6aee