Malicious PDF — malware analysis report

Static analysis result for SHA-256 1423b5cf3c350568…

MALICIOUS

PDF

74.3 KB Created: 2021-06-27 10:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1014c3810342f67d9bbfd3a1b2a0a952 SHA-1: 1412db87928a7122b2caf067c1a3e6c821fde24f SHA-256: 1423b5cf3c3505687ee86ab0abd0731a5e75ed8073c11835b834b01d1a6b9d94
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3db256ioboucmmvvpcg50h76nc/merogajefabanikifuta.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd8032d4d---fepugid.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7b749fe6ae386161fa1e41f3e51ffc7e/pekujijoneridur.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b02024d7---gasetasitudoxufesewukaze.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d0928809ff83817ea27908abc65422b5/32865834327.pdf
    • http://rustproofingottawa.com/userfiles/file/57372867753.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6af79f66---pawijuzekomako.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a52b09ed7---36625469030.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d38a34ec---63620718213.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/93e1ca463e9413b124a13a18c67406b1/47587376959.pdf
    • http://konemara.hu/userfiles/file/nixaxag.pdf
    • http://boekenwinkelindex.nl/images/uploads/15132564238.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607392122c941---63012053180.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b223f54726---40761218288.pdf
    • http://cupta.org/userfiles/files/20210528064420.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608303f5635ca---95878452682.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b0ef50975---81311232926.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zugijokotovobokij.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d49abf17---10562091016.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/xuvamofivodozisag.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/c90iobg3gitm2eovn6joc5fbn3/97434707726.pdf
    • https://gastriklandsbf.se/UserFiles/files/56005343950.pdf
    • http://handsonmontessoripk.com/userfiles/files/42623673870.pdf
    • http://www.ecostroyservis.ru/File/9842902279.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805135d6859---wibenezavewoganokonon.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d1083eed---68535972652.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=question+paper+for+ips+exam
    • 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_off0000c1a9.bin
5b037398f913f0c424e16ce05f4f20b4e99487e7cdc8aad4babcfa00dc89854d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 16040 bytes
font_01_sfnt_off0000eae2.bin
18fb4d44e79117a68242bdd55c10b4998723f0361a820dd4ba15832df1777af0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 10736 bytes
font_02_sfnt_off000103b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 16792 bytes