Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d7a9f17c83e0a6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 18:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6c3efc41e918e1d027beec062b6dfe7a SHA-1: 31c2d1f4a347792fb4c66febe353335013965a6c SHA-256: 56d7a9f17c83e0a65bde28270adb11edbeff2f7b2bd5d367c9069c120bf7c355
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms on potentially compromised CMS uploads supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fruitsad.pl/images/file/34376278172.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/24741393915.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c920ccae7f9---25020729856.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/59441332265.pdfIn PDF document text
    • https://ms02bet.com/contents//files/56694183248.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/41495855954.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a149d3f0d01---diziwegexeruluxaxugope.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210829181659611.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea63176dfb---valisukona.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zuxitenuferaduru.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/88aebb24dae34fdb5dfe55300de2c88f/32171055647.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wijepoxutelugivexudifap.pdfIn PDF document text
    • http://montesantangelo.it/files/files/14739955815.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b656117baa7---xofomumezibureli.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/38607452510.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rg6hsmh7s6pa940i9q4sb13nvo/84134524732.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jewilojowib.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/gigofomexukusafife.pdfIn PDF document text
    • http://mega.kz/media/upload/files/jeziri.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0ad9841228853445f5f16d254bf0202e/kizimo.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/tokikukogikefu.pdfIn PDF document text
    • https://chptravel.ir/data/file/lumagutisimerirofufulu.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/bevonudenuwunewede.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/wutixukefexoxowebamorake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=notarial+law+2004+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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 10472 bytes
SHA-256: c22dcb668b10614d5b5106cfe3c873ca8476ca58f20f0939e4de99d384af97c8
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 17324 bytes
SHA-256: 2926074c3bf0c0c07d8304da074598d90a9e8a3ff56a932e333b7713af4ca74f
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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