Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2872613018c3e8…

MALICIOUS

PDF

79.2 KB Created: 2021-07-02 15:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ecafbf21441282ff861630b3f02b40ef SHA-1: 98dbf6500015927c30cd78a967512a85ad380a42 SHA-256: 5b2872613018c3e8bd525ef6a224d3052d1850de8fb2d8c088726b18f3dfdac4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://soechi.id/userfiles/file/10729096808.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/512cv2uclkosl70883td1rosqd/posoz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d6789350a639389c46c4e8dcde18f95/82576792221.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070818f5b068---35480954677.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4jrnc1csrtp0pija8jbot0j24e/40629343038.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/41792694509.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39f8122f7f---11803021684.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d5e9c5b7e---podavejusopenudugo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8up7ir84pq2qkv3k1n9tjendi2/latodujoruguxerevitoda.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1d4b245d32b995591cb458b55572c0e4/mobunixutifal.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/terarepewisimi.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/pewuxuziriju.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb9959e6d---berisavalibunesavuxak.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70feb003a0---rekolojatamijedubufuzuxo.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/nilimenerajegepiz.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/35617059192.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d797cbb566fc3015339e8f2e5ef28bcf/60226933650.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qp51numlu5dhij3q3tsgtg34v5/67427801796.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a8f427dd37d2a39988438d7b2585f5dc/75450080438.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5ad46546---9194018385.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb6ad08a4---46122518822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+ecological+thoughtPDF 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_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 10200 bytes
SHA-256: 09c6ff808db26460741b117078561a9d7c9c117f7ef466b58a477716f1f42da3
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 19248 bytes
SHA-256: 24a213ade1a68e2aefd19c51ee9c00046541e1f4e687e832336555c7a0b227a0
font_02_sfnt_off000117e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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