Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f86f5722efed44b…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 20:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7d020ecc565600f58b932ca481373ab SHA-1: e918678cac6281e4f5a7a7406e46d9df4de87b7c SHA-256: 0f86f5722efed44bea15e4cfe6986ca4cb65fc071f443da05b9ba2b52a44bbd9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics reveal that the document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba385dc063---3043177235.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/93330320255.pdf
    • http://diclenakliyat.com/userfiles/file/49531542008.pdf
    • http://polipack.ru/content/file/27328374468.pdf
    • https://baxsporthorses.com/userfiles/file/bebojafizetibawefitif.pdf
    • http://cascinamana.it/userfiles/file/detogatovexofamev.pdf
    • http://o2ashop.com/ckfinder/userfiles/files/15433411826.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/a559d13a496616804937a1166623540d/bivoraferilawef.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/viu9j4t2pmbm5in2iv9p9b8hko/tasemarodufumo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29ef49392---11772660415.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/40973055488.pdf
    • http://accronline.com/userfiles/file/bogatonorap.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/nu24r9r94b6ig60td1keiebja1/89613021277.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d2c0a042018954a4589adb13b55415ac/93233746980.pdf
    • http://nfc.soo.jp/file/20689033126.pdf
    • http://tomaszskiba.com/userfiles/file/gezividafifaf.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/638e9bcee76316ac64c3e52d57e1d2ad/xoxat.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2bce75000f54480f7685e639ec76700b/nekotugofimasivexerazos.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f068a9a4---97090251199.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20f2abe64---nudogi.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef05439aa---bafevarigajewosojizopalox.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/soxuponugolajoroxajilere.pdf
    • https://emprenderem.cl/files/25317358382.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/032c80a21889afe51f7f182774c6c3f7/pikevitu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608863d361394---41754423838.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9b6431a3b7edb853acbd858600ff792e/5407614992.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/33q8fprlkadl70dt7gi9eac0vq/gutobevivaruvuzi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+years+is+a+bsn+degree
    • 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_off0000fd52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 16792 bytes
font_01_sfnt_off00011564.bin
3c81c75346b6857f24c0a95a050c56cc5e4f418f1709b290e0f06a1a988e00b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 17240 bytes
font_02_sfnt_off00014267.bin
d4b35c1165b3013e5e6a8a9a3f0256405b157f6f66ae30cc988841d54ee7b86a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 10780 bytes