Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24089bec51e06ad…

MALICIOUS

PDF

77.1 KB Created: 2021-08-27 15:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4037ddefaf9733ca2f784800f9b7ff25 SHA-1: a47141d5a4d27749324f85d9e3dcd2bba10a3a9f SHA-256: f24089bec51e06ad89ba7ca12850f3ae2dd27b3ea064a9e98d1a60b4842b2f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs hosted on compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kstarsmall.net/userfiles/file///pasarureluki.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e530e9351---11639758370.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/84a31d061ac43ccee1b67044ee9ecb5b/mokugevixikose.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9edd678697---97142271078.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8736e21a4b---18901588279.pdf
    • http://anvlaw.com/userfiles/file/fovot.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/30222069104.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac0da854ae---16841415887.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9ad958cafa3aebe87500dcaf8c695aed/52564381597.pdf
    • http://orkoien.com/userfiles/files/62493673804.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c35ad614---89034114028.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073a88ff13e6---sukisofefebapibidido.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/37441483369.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/d4u5jf1abtlaskjsk2th5cbbeb/58049637048.pdf
    • http://immobilieninvestors.eu/userfiles/file/xanabezetat.pdf
    • http://digitalqwerty.com/ckfinder/userfiles/files/41689683468.pdf
    • http://jevades.com/aircraft/fckimages/file/jokedevuropaluwila.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ddea11185821fa1569a500856447a819/16291737766.pdf
    • https://rajatotogroup4.com/contents//files/sedijawoso.pdf
    • http://colorfulmedia.de/fotki/fotki/file/kadodexanezatalujik.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f4c0107a---guruvidasiba.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fb2mdq76c291tf0fcqo2v5jdu2/xalakuveguba.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/63751619907.pdf
    • https://wrd13.com/force/file/sidoniloxido.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=marketing+information+system+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 16792 bytes
font_01_sfnt_off0000e44a.bin
bdd44518e686f65893ebd5a455ef705ac0ad62412d6e067e43ea85685187f33d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 10712 bytes
font_02_sfnt_off0000fcf1.bin
d2bb38e40e609e201eaba9a78328b0ad50ac8ee12f7fd97087b392ed32c25de3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16056 bytes