Malicious PDF — malware analysis report

Static analysis result for SHA-256 741b444927ae2fb3…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 14:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 601abaecf17504b66f03ca842ee7021b SHA-1: 80dd433be08fe9948e1cffc31ea5a9ea7791afb5 SHA-256: 741b444927ae2fb305c349125dc9c5a92950910ef2b83ef18595c74037657aa9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or scam campaign. The PDF structure and embedded URIs are consistent with a malicious document designed to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://nomylo.ru/uplcv?utm_term=stop+unwanted+texts PDF link annotation
    • https://diaochue.vn/userfiles/file/gadezixune.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/baboro.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7dd467bc9---vopuwemafajotubusupakaw.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d12a8315---52971854303.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c1f9115bc620704fe1fb95b687dc538a/mukesabevilinakifererawad.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qtrouorq9lo76q88c3oa85mvle/tiwigozigupokonisoxu.pdfIn PDF document text
    • https://citronel.com/userfiles/files/bazuviwugojegekegavo.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/suwibujitimesurisi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/26a281db6c798e9dba43023863e07be0/xosukigi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160703da1ae287---89557290787.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xidofadagugukowulureve.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/8f2a498bea98ff40a6fec9f70883f13c/37340299348.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/3708648678.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e352023fa---xoxubinejuxakegarep.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3d61374d---xisedugepedetos.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/pitun.pdfIn PDF document text
    • http://rayer.cn/d/files/93190475838.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc483ba62---kidexajiga.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/67faa4dcb6fcaa2f39f8ac2c316d1f6a/67724204185.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/93425450283.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c3456336b---nejurojusolepaxi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20486522c---zepitepoxefuxowuponovox.pdfIn PDF document text
    • http://email-database.info/userfiles/file/54854572777.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e7c1f642---52526918744.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e704bdda98---jotexujokirov.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/92030812969.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 18096 bytes
SHA-256: b2c6ed96ebd67ac54c8f49eb834878d7aabf4880e195ec8d931f818ee987a0a5
font_01_sfnt_off000118bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 10512 bytes
SHA-256: 7b5dad95fc77d5146db771abfa4eac80897682bf63c0159987cfdb0c001247d7