Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b10acae03677372…

MALICIOUS

PDF

68.4 KB Created: 2021-09-23 02:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c7f49921f3a60661fa23d31d536e1c9f SHA-1: b0aaeaf26622dd2feef78fef03bb023c68c9ce82 SHA-256: 1b10acae0367737206b22cce3874cc3029f4f6be6b98bca6502ea0be7184c6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pixomot.ru/uplcv?utm_term=soul+snatcher+film PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3565b342---58434740827.pdfIn PDF document text
    • http://recviem.ru/img/upload/72529374208.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/50851010423.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/25921270726.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/siguvufogunonapewufemizuk.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/vakamalexaw.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/70886523103.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/rojodutilisedogevalegib.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/vidisojejajuburix.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zuvoxajovetixejaruwa.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109200805517541.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/94043065044.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/93718448916.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/zeburime.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/29123416184.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161363f456079f---37798358403.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/56091426835.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/90393003994.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/82291400591.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614811b68d5fa---33568355497.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fenasaviz.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/9712962993.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/25415314127.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 10776 bytes
SHA-256: b58f4e454065463395fcc24847cac53989decd06bb968d19259d597d0c6f25b8
font_01_sfnt_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 14636 bytes
SHA-256: 56e6187eb04cfd8941225f21df4f86f1e60452260ea33ee6bd00e97d47d1791a
font_02_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1