Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1843d2b7d4bed…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 01:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8804deaad373c116a541f290420762c1 SHA-1: 8d1a4de8f190c02fbc0ba5709e6f181a802f37d5 SHA-256: bca1843d2b7d4bede64aad4456036bb760813de36a3951e7f3c980f20bc76f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=jasper+report+pdf+export+properties PDF link annotation
    • http://phongkhamthienhoa.org/images/files/dumakexofagejajo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/golagadifodenimudabu.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xobog.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f8e97285e---sanunedotojegokozurebona.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611f5e2acf8f4---88213520241.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608eede0543b7---dubodal.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/wapezozogifenejes.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/1572230018.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h21rcqbptduqaklukn3trkl3t5/toperuwevus.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/boroxuzede.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k42dkrmupsan9lctg6rnufv4c2/sidig.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/68675360400.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tovup.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2aaddc9028d27efb3da1ffc15b818a8f/jusizujedopiwipelejul.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff45424de---85979368541.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202108261347419588.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a479e30c1421d6de33e2437bdd48ca1f/75731173178.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/lujopetig.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a442d580d---zegirevijegilufenik.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/13182921489.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8ead3b61884f7425bb4fc232cc508ddd/29283052930.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072445f2d560---2871671932.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/zimivoruvuzagakuwufadege.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a6ba4aa2a4ffa814bc446d05ab384d4c/jojojixak.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/navamisivibamukesa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2sq0n84179jrhbh85t9tdlh32q/9790360695.pdfIn PDF document text
    • 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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10436 bytes
SHA-256: d3fad73545827d1faefe3eba31af8124adbd8dd4e62674d687ec1b3676feb775
font_01_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 19412 bytes
SHA-256: 75587c6e4806df8f95e20968703498ddce78c4249bcc0e930eb490df23554eb2
font_02_sfnt_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1