Malicious PDF — malware analysis report

Static analysis result for SHA-256 c659a0418cd6cd45…

MALICIOUS

PDF

93.5 KB Created: 2021-07-22 16:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be39402237a481bde00ce8285b543674 SHA-1: ec4120533ef766825e6362de7feda60b59908f12 SHA-256: c659a0418cd6cd45099517fa4390bd7a587f39baac8f6c5d0fdb1d9e07d80ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress upload directories or other disposable hosting. This suggests a phishing or scam campaign where the document serves as a lure to direct users to malicious or untrustworthy websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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://al-bandak.com/userfiles/file/97644453407.pdf In PDF document text
    • https://ms01bet.net/contents//files/73671787073.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be704fb6d1a---87502973604.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6d968fbe990c56c4562f05d57cd6cf79/lifaxirumijirav.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a796ce16557a94972935450aa5a5f113/somovomuz.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/767f1d0c6fb3ecd65516b3cfdb77d9f2/zunokawiravavetapurivom.pdfIn PDF document text
    • https://flyags.com/editorResources/file///75100266064.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8f78903816fb935c8094936ee9895f8b/85443952564.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/xunamikugepimitonilotobur.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1d557b9b7ba790354e6c2ebfb541c20d/61408984532.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94592352221.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82bbef032---39636866390.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3qqc3io8e92ssk0f8h7or267lh/begojagesapuzig.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8eba8f916---nupabegesafoxabowukudi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/jowoxodejun.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/22986232998.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/fesutokujiji.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/zujufijedobenegevufovi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/72b7d3f53dae3ecac0289ced5f3fb713/30118220888.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/97767078713.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210610092419.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892c5c1965---76415840999.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a09b1aff6---wosizepikalukotonixifapev.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/22uorumiqrjpc6tg05l2nhs04a/22417312604.pdfIn PDF document text
    • http://ezibra.pl/upload//file/16818256474.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09087c02f2---ziduzobidukuvunajetisi.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9140935fd---mamefagejesizomilani.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/fozusexabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=put+things+firstPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 17448 bytes
SHA-256: e0d8008eb219d87acaa4f8c2596e6436999b05120180746b6d040cd9784bc61e
font_01_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 10136 bytes
SHA-256: 561454d9f0056185e95ef04b8f105aca237809a7bccbcfe0585779f8faa595a1
font_02_sfnt_off000146ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB9 1968 bytes
SHA-256: c7e7d125e82ceae927dd20a3878939955b4934ad90e0cfe7997f0c24e50dabaa

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