Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c164a76d0374ced…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 20:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7ddaa1d41cd5f369eb1634f5a647142 SHA-1: d8fa50b236c5bf8608f58f3cb7850cab8d58dc8f SHA-256: 0c164a76d0374ced63fc36b86c98cae9baed91deec0efd8de29b127e04ee278a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting a phishing or social engineering attack aimed at tricking users into downloading further malware. The presence of a link farm on compromised CMS uploads further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/bd2kked5psqkfbhbtql772l6mu/suwozopunetemafugemovotiz.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/jizobufovewasum.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/jasupexajemilarotinekimow.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3de0144a2---69091423692.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/54470ef830ffa662e9718a5476d1a517/10309941397.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da88f05ec2d---pogixo.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fa4c7eab5---92475594170.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/nigaxejixubava.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/701e260b5273d42b626c042bfc830eec/26612699941.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/nuzofajelujit.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/84004313295.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/lametaxejugepo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d763ad806---40679554902.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/liwukijisataveda.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/q2r6ack729i70k6jneg0n2k8m4/7287444064.pdfIn PDF document text
    • http://adveotec.com/img/file/xokazeziwuzisifel.pdfIn PDF document text
    • https://latework.cz/soubory/fabisagosalafat.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/382738941e3601d28045849d5daf27d3/79290617597.pdfIn PDF document text
    • http://hydrem.ru/images/file/sejenapatumije.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3b4551083269e06b88aa126f349c73d5/sakekidunomig.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70bb2a2f7---26187892755.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/34492169318.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/lukixugireginuvewasuvav.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/57509414203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+download+of+gta+5+for+androidPDF 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_off0000bbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 10560 bytes
SHA-256: 2795dcda6f5f9de886c509e2dabf93f5c66f0d3d0a31a79a423f1697da7a9af5
font_02_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 14092 bytes
SHA-256: c22f11d24df8de0c5bf12a734a8bc1312a5e8d07aa45e95704d24824582f091c

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