Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f2c4c9548f1e06…

MALICIOUS

PDF

96.1 KB Created: 2021-09-13 00:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a07fb208bc150103bf764d361c3493e9 SHA-1: 143a9cc5c830c115c23765a540c4942356f2bb2d SHA-256: 11f2c4c9548f1e06ddd5fc0fa4e622649448f2de05aa64924d370331180c5fd0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://nwatchonline.net/userfiles/file/19562748629.pdf In PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/15243346761.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zajodoniridotixoza.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/xadudufe.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/fekopeporabewexekusibi.pdfIn PDF document text
    • https://anup.bo/images/files/21057317877.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/87217031411.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/7878389075.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/tizonam.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/xanibuxif.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eeb101e32---81066196861.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/59244223109.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6937d55c5d79d191bd9bf29d5af7e797/mizenawevadirabagoxix.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/47266891459.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/54989298992.pdfIn PDF document text
    • http://iccarrentals.com/files/file/sagabekunufulo.pdfIn PDF document text
    • http://mextro.de/upload/files/73976374928.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/pusegav.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/53974788935.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64d52e4dd---regosojugiruneremagix.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/43715472508.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/74280352445.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kufijitesolepozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=angel+time+444PDF link annotation
    • 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_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 17900 bytes
SHA-256: 40d9555d921473c70b2c61d8a590f1c4e5fe73baaadf8aea067d4fae76da1ff8
font_02_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 9960 bytes
SHA-256: 3c1e27a0becac064878f1d5193559ee86d51ddd2b2deac9a98de18deb3b80687