Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56fa337468c77ea…

MALICIOUS

PDF

87.7 KB Created: 2021-07-15 14:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64f7931765639fc8fbe94b069f78577a SHA-1: 286fcda490b24d989888775ab9cf718621c209d7 SHA-256: f56fa337468c77ea7e94b592c787818b102cb7f21c7bf591a7eab282f73b34f6
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 a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the structure and URL analysis strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/60b015q66pvabg2vmg0shs2fe9vnatm6/56838441057.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072519019620---liduduvikegibolij.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea97394690---40124503204.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df59e744b7---zidigatopuxomutulipu.pdf
    • http://tribo.kz/userfiles/File/xabex.pdf
    • http://aucoindeshalles.fr/menu/file/puxubesato.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e6332208---mofixapuludepokop.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/o6f51m6ck1s1tlu6tk2ita7416/60845789115.pdf
    • http://lbtech.kr/upfile/files/88389813623.pdf
    • http://gyobel.itpublic/file/doxoza.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160841321c836b---1600498132.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a983fe91d58---babepaxasunojekunobeborax.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a322f8bfd7b---pexaruripumisa.pdf
    • https://szallas-karpatalja.net/upload/27668144165.pdf
    • http://www.vljainandco.com/userfiles/files/wudujugaziz.pdf
    • https://ndmoyun.com/calisma2/files/uploads/5582142322.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/13830061341.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82522242682.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/mabagoguxenebiko.pdf
    • http://lagunaapartman.hu/images/user/file/nuvolubujowewoniboxi.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4jgqi9pqb89ql5m29abof9rj7m/78316423526.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c03a967aa---bafoge.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+child+is+born+short+question+answer
    • 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_off0000f212.bin
0d2582c28db43162f2bc5a3a7690f1937bf02bbe255e7b3b798217ae3f82e07d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 17048 bytes
font_01_sfnt_off00011eb9.bin
2735da8c614f5eaae33190712f6e76f036dbef863966af186cc09d7a9fec3a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 10920 bytes
font_02_sfnt_off000137d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16792 bytes