Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd26aefa575c7b6…

MALICIOUS

PDF

91.2 KB Created: 2021-07-23 13:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1644ac027a52246e84627d9674131a0f SHA-1: 60b15c6eba08372d41fd5b985b9f5d76f885345f SHA-256: 3bd26aefa575c7b6dd6b1a31993fa58c05a450dbc6026f18807338f32d55c432
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to compromised WordPress upload directories, and employs a password-protected archive lure. Embedded JavaScript streams are present, suggesting the potential for further malicious execution or obfuscation. The primary attack pattern involves directing users to download an archive, likely to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070c5d48f766---raduduseveruxevuzuxugurol.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61ab33e701---52648058881.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/loxowuxori.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/guliv.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/1sik7gvbououv1eh7vvbmcepkl/39133200440.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efd73c362---vusofolukiwupirimagu.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/mujexuwer.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/zigedugiri.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798afb9b829---tamotigelekuralakanozu.pdfIn PDF document text
    • https://bursac.net/userfiles/file/venipar.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/tepodamonokenetuvi.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/zozuw.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0b3a5b3d5---tidalekimepuxozofase.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070601f63f8f---bisow.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7302a9171d---bexezakumilokarubupefix.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2800c583f8---mopod.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b522002ccd8---linikikurabidi.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/zepiwimogatumod.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8d9ec027793b97f2447e7cd160fec718/5649136759.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cu164p5puelj38r25dh00nmeaq/kedazorevomazez.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c6435b1444b256395884fdc433db7e0a/26582383841.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6c8b5c08---mutopubebeguzipan.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/9vs379gv3ddpg4pka6ms6fpj89/2159965090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exempel+p%C3%A5+%C3%A4mnen+till+informerande+talPDF 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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 17324 bytes
SHA-256: dbbde6fd1248bb411a33befb5b336e0cfd5bb85e8d429a56c24b2296b2daefdb
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 11096 bytes
SHA-256: 9f43010a8821c35f1e1ce138f5c3ccf897450fcc475ccf8c0791ee3aa03d7562
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 17200 bytes
SHA-256: e107171361c62b8ac22454687edbbb5eb6acc1bef0e66b9aceca55337c0a3380
font_03_sfnt_off00014462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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