Malicious PDF — malware analysis report

Static analysis result for SHA-256 689e698705223187…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 09:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 685c4e65b9e70d4849a024641d8f4d53 SHA-1: 2b7d8e45a0f0cb10ae8b813f33ca40ad5f88790c SHA-256: 689e6987052231870634eb3e81e8ecd09e1e9f46bb3e02a8136f2d21c25b4cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains, designed to redirect users. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript or other embedded content to facilitate redirection, hence the T1059.007 technique is included as a likely component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/nusofene.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba35e52f361---94294915670.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3655bf81b---sikejowofozumusonolidog.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/89265778437.pdfIn PDF document text
    • https://scalper.ir/data/files/file/pidozoxufezivebezutoruw.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c56af687c3d---nokan.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/92604713336.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160910428c6b82---83490626767.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/fivazesepugekoj.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf648ae85---50923916092.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/10820480553.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/4664553148.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/wafatarekozuvokatisef.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7aa8bc6ad---65004589597.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/biwolamezividolobigin.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/13353936423.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/sutibog.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/kesazudo.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/fusevomaninefug.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11d9409aa---62216119212.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ce921fa96893b44fa90b375c5829019a/vuwobove.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cb341ec66f1ffeb6849352caa6aeee33/25676561846.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/20319792659.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/60523157334.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e5a0ed555da667366c309f8fa000bb82/36010310801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=government+tenders+and+procurement+law+saudi+arabia+2019+pdfPDF 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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 19472 bytes
SHA-256: 6282b8f2105c1fee3bd81b8f841f8db85fd9666cb828139357bd99f5ec463ccb
font_02_sfnt_off00013b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B81 11672 bytes
SHA-256: 13da5e49796c81c07e2d17fbf84958b32d291f7a0d544b685a071c867f08bcad

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