Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb5accc2fed68dd…

MALICIOUS

PDF

109.2 KB Created: 2021-08-03 16:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2d7d6a30c28fa2616e4c2123d223037 SHA-1: cc12bf5b51da3da3e1cb6a7a99540e352facb722 SHA-256: dcb5accc2fed68ddae0ca2674902889ac724762210908922550ffb05c721f809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://archism.ru/uplcv?utm_term=expert+advisor+programming+for+metatrader+5+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eacf472da1---81317470643.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lurufiluxonegimejikelum.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tewosovesusinewifed.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vasisuge.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5c6361ffc98adaeb9b487f094bd1e03f/9196645578.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e80b0c1d7---tejatobukowafevu.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/woxejujeloviduvuw.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a7841892ded---64696213809.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/wikubamujexabowulegabub.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210625190101.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/witisu.pdfIn PDF document text
    • http://sciattella.net/images/file/jepabejevulatu.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1626901275.pdfIn PDF document text
    • https://norservis.com/files/files/wojiwivilajogaladi.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/29518248190.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/wifed.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/sesetakinotofimogolu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe0325ac24---87724001735.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/pedol.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/72071699471.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6143e0e14---kilisojemitonuvagulewibew.pdfIn PDF document text
    • http://allycatering.com/userfiles/34599876315.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911e59873bd---67271452513.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/63823506806.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015873.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15873 27684 bytes
SHA-256: ab4c8df1b525c97031a5f3552ad1e59ea397a3f836a6577368325f73a8462c46
font_00_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 23584 bytes
SHA-256: cb694a871fa2e93fec7ae79d660fd8cd9314d67f719975b702da5a431859d6e5
font_01_sfnt_off00013ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 17208 bytes
SHA-256: 6be1ed53ed35952afa8cf363273ef0e21d7253fd42250511edb339f001295c9a
font_03_sfnt_off0001893e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1893E 11080 bytes
SHA-256: edf9ad66bcbe6ae26067aa331fab700483b05bbce1027d9d383c7aedf9f9ee26

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