Malicious PDF — malware analysis report

Static analysis result for SHA-256 938e28546a3e9431…

MALICIOUS

PDF

75.5 KB Created: 2021-08-09 01:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1f6bfb16c57211408b2a4186a10a715 SHA-1: 788027b342844ca32b76edb4fbeb4345b44835cb SHA-256: 938e28546a3e9431404754570ef532ac1eb9ee163a0741d484f8308ab8a78fe1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://brooklynsmokeshops.com/admin/images/file/59478608500.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c7baf23da214a3a5992c2a945c0c0364/43628907102.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pesewiwuvasi.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd59d382d9c---gatukawasitifewexilari.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5k4ta2tvrlgs25l56n5emjnok1/13674662828.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/suvejavakol.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/14544149343.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/jimetaxitobiwufanipaxumal.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094be67873cf---40166631778.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/22839530514.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/katejadu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d83f1ae55---lukuxobokelufawadugog.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/39154293816.pdfIn PDF document text
    • http://clarasonic.com/upload/file/wukofamalawigapufem.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607023d1785cf---zakijegojogofokusokek.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/29588422738.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d51b8e25c---22892799522.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/99971573491.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162636145284.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a92b83b5---54346237274.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/wosirelovirulilewajidudom.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/ketufavuno.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c96f0df27---kufobikubamase.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/81637116084.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///73942285794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+cap+a+beamPDF 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_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 10244 bytes
SHA-256: c9c8ac3608b96f7a67714c3a95be4ae463df77e3be505bd042963c81e55ba7bc
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 15200 bytes
SHA-256: 2e794af7d248daac2f45f990f4da4237888e52b2bb4efca11a98cf807bb7ccac
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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