Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e4692ae8e3edcd…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 702178a08fb63275b32bdaa635504f1a SHA-1: 1538ce31e29015e83455e3e751e7beacecab9152 SHA-256: 07e4692ae8e3edcd4db3edb94fa5fd3b31266014a528f12190e14aed353dd7b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=understanding+business+mcgraw+hill+pdf PDF link annotation
    • https://strings97.hu/userfiles/file/88073584882.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/deb459826a93733acc54990fcc2f4daa/feredugosipij.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/86142660746.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7b86e8fabba3f47f26dc279869fff721/61903147550.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ac5ef34d---kamedevimu.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/32726896980.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/pntcat01trrc4ujhahs3v7o7t2/lekatifizoso.pdfIn PDF document text
    • https://schmitz.cz/res/file/99104776366.pdfIn PDF document text
    • https://fishboat.hr/files/43727852750.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609427d546668---bawusakejatafaroru.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/kezujitiva.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/42244781965.pdfIn PDF document text
    • https://andrejc.si/files/file/54258133957.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982e38f32de---14534299370.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/5296462016.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3e987e9973afa3d425b0d0568f1b64e7/74811793581.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e694772623379615e6db940217205deb/98382462449.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/36945745926.pdfIn PDF document text
    • http://kasargod.net/uploads/file/62404906918.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/xotoxuge.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128386469586---76493985458.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/tunamosumemimuwonuzuf.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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 17620 bytes
SHA-256: 0db054fcc54bb78adb15391da6ebb4546c27c661dd991fd59994fa876dd10e1f
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 11280 bytes
SHA-256: 10cd303e1240301c47bf989fc11911c7241991e3ba173181efe2e022ba6df153

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