Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a708eb3d1f9da94…

MALICIOUS

PDF

105.6 KB Created: 2021-08-04 10:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4e98183693892d2f472691543a4cd60 SHA-1: c3d0efd3ba154f5731d712e5e78533fd5ed09654 SHA-256: 5a708eb3d1f9da94ff120a8e76c9f0ff1964948501189e6519517bdfab51e941
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jfe.hk/userfiles/zulip.pdf In PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/lalobipatowi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d103169b---pufomujibonekile.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/fedorobibazabimuj.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210621115204.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d6d8cfbd---61319914800.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4a3a03d6bcd30e332818b74be25031af/sekimugig.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0cd8c1461b97a4bc3da7810a97dc4fc0/melugenakixo.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vigalulibolamibajakidel.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///14045063652.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/91caba71832842795ff51a1fc80658ef/31829061613.pdfIn PDF document text
    • https://bem-sa.com/img/file/26133891286.pdfIn PDF document text
    • http://edgecs.net/documents/81444397438.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/50044992057.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/mazozomawuxufefogexuxe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b0819277---1324992133.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/74508656041.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/gepivoriwejosudobawo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/xewulupobawa.pdfIn PDF document text
    • https://argumentua.com/i/file/37094422561.pdfIn PDF document text
    • http://domplus.su/userfiles/files/87633834881.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zisirav.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/aca612a8f93a0778407b6bf91be1b171/vagajamago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+karate+kid+full+movie+2010+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 15180 bytes
SHA-256: 6384b4b49b4d23765060f4f289ec4f0676d3668787584f53ae2941b8ee9b18fb
font_01_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 10864 bytes
SHA-256: 936b89af49e295f8315d356299bf84ae4fb60a087b1837a1c7c38d6d36e6a6d8
font_02_sfnt_off00014ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC7 19444 bytes
SHA-256: 6b4eaacc5cabc41d18a3c64622db3eb66c60778d271b955bd5874a515fb294e6
font_03_sfnt_off00017fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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