Malicious PDF — malware analysis report

Static analysis result for SHA-256 9048776794340d85…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 18:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dbf5866dfee5f2aa6620cfa1a51eadff SHA-1: 8f31b6b60748d02514bb37c92a0f859fbf2d46cb SHA-256: 9048776794340d851fb7ca6a05b73c3796947bc167c9d5d1eca88a4abb661bf8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=ncert+exemplar+class+12+physics+solutions+pdf+free+download PDF link annotation
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed24874d41---83414268844.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210830/files/20210830023346.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/nimibegodajufozesujoda.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160744ae531385---45758180981.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/vaxemolavotukujumiraw.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160926e850c61b---55779692727.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/01d1a9f6c8d2a20dc8ee7948004f9b00/dusaru.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210517013512.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/35004658165.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/sezemabujedinoxo.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/ribabiputaf.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/43029347665.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/7808534990.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/podemodirupujajamijobemu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19b7601752---47984377282.pdfIn PDF document text
    • http://rentaruedas.com/files/others/mowasabiviludeda.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b3b0ed9c---tirumotexebubodosax.pdfPDF link annotation
    • https://regionalhealthprogramsww.com/images/file/lasibawepekisijewap.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/27602009101.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/57323171128.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/29690647696.pdfIn PDF document text
    • https://kede.org/userfiles/file/45620255967.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/69064720595.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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 11436 bytes
SHA-256: 8caa468f33a15c77a997346dabc158b3180313921697abd5793931b296903473
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 18368 bytes
SHA-256: 010a04818e2291a3884ec21d51f97e766ebbbdcaa1ea524edf62cac3246a2f82

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