Malicious PDF — malware analysis report

Static analysis result for SHA-256 937c9f9306c7b8cb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 23:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ddbcfa4fe84c542613a171e1cfeb9a7 SHA-1: e0cc4cd93765be74cd14147af9055916dd217d03 SHA-256: 937c9f9306c7b8cb58f1406c3dac1e8e3416fbd4c5f27ce4ac2975c3a1e55415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/6992099942.pdf In PDF document text
    • http://daegyung.kr/userfiles/file/20210830162224.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/nomodekoxavi.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/49207117011.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe543a13f6e---1158732797.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/97071900150.pdfIn PDF document text
    • http://santeh.md/img/files/risigoduwop.pdfIn PDF document text
    • https://doitoutdoorz.com/file/KViLU3wLaiG5FoFD.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/30668260397.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///17913640613.pdfIn PDF document text
    • https://emprenderem.cl/files/56611536335.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/wabufonuwolojezuri.pdfIn PDF document text
    • http://gistys.com/userfiles/file/posavedubapikigonor.pdfIn PDF document text
    • http://adice-area.com/pictures/files/kapukelawimukixef.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/daa02021cd19793adb896200b4501d90/befoxojenirew.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/pevovukotakeganufisul.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960e5c4c007---magedezibixajuvonu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/28024565014.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd67a08bae9---5546617406.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/gepasoxelumajaburirusu.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/gokuli.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/55963508611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=manual+de+servicio+heladera+whirlpool+wrx51x1PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 11044 bytes
SHA-256: 735f0e8d7de4c2f501d7d18c1b43d6e7bbaf957719d683444eb59b192565324c
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 18140 bytes
SHA-256: 12b041f7e9da71d20b8d682cabbdcef87700ed5a5ce7a07006d6702db5646ae8
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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