Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a83ecebf43d63ca…

MALICIOUS

PDF

87.7 KB Created: 2021-07-02 18:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a386db214a83f04629746770bc3acb5 SHA-1: 848f84c266cc2779725a02b17bd9c4c75d9dfdb1 SHA-256: 6a83ecebf43d63ca2578d02794268826f3478656daecb74194dd5a3c54575934
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a link farm or phishing lure. The presence of external URIs and IP literals further supports the malicious nature, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097667b382dd---navamukape.pdf In PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d62bd3e03---95410092706.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/xenopagadozironibabadowuk.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/degatubodavagewudi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/nujavivopikutoka.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b553f29d49---bafanolefoxobizizukomobip.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/17b43cc84e3fbdf36cbababc3058d39f/56166345424.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea57087029---mivum.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160976fc072e31---jedefav.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/xojajutup.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16079174e5148c---91543155262.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/87394225391.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/80562304970.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb2a6ee31---moxejemolak.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/df172dcd539d43a16d21da047beab840/vuwoga.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/76050084955.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/21457888878.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66e7215e2d---4230135461.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e601e921ec---kazukudetadigojubugiba.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a1623bf97---wesideri.pdfPDF link annotation
    • http://studioagronomoserragiotto.eu/userfiles/files/75870736658.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dok5rrgimgqiumfug7tbti3m76/govurekuvuzufini.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/82799142234.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c448e3171---dosisu.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/xobazolotebabodivufa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8af54d22---22216943301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=weighted+scoring+prioritizationPDF 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_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10800 bytes
SHA-256: 5c77802e7986acd5e90480d47748d7483fcd1af2454c7fbffbbde095af16b204
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16808 bytes
SHA-256: f0bce75c58e65716f75129b49529b8b232c1e90e6337fa4c0e99ab34bb115057
font_02_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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