Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6d2cc6fa670db9…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 02:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 253988358df5e1b8d88fa6c9fb2fa78b SHA-1: fd2423de356445db04bba2ced7f8fa66b13d13b8 SHA-256: fa6d2cc6fa670db92ca184fc89f3d9c1255978bea620b3d3435d054d48a780af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The presence of numerous unknown URLs suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

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://livre-d-art.com/ckfinder/userfiles/files/jafije.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406906e0a39---javewopijolid.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25413315608.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/5b47d42dde711a41a6f9b8e20833ee19/netovuwegomuponedun.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/risipudajen.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/57031896226.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/22328734774.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/jovomibejud.pdfIn PDF document text
    • http://cochemical.com/upload/files/wepepazajotuso.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/gexomamogewizekugut.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/60222665303.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/57759727522.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/74857029053.pdfIn PDF document text
    • https://podimercrm.com/img/files/nixokazaxatawuvigup.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/68892060864.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/duzuxoropezubedin.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210914112015.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/36517773470.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/its6duku10vjoihbi9un4bmu7a/maliwexuvufekupufal.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/mozasovizaxasazovatamab.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/78163467969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=boss+web+series+watch+online+freePDF 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_off0000bdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAC 16976 bytes
SHA-256: d2ee0fd5cc5d694f25591a62cdc4030d81d78ddc9aa3a401b168b4d3670927e1
font_01_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 10712 bytes
SHA-256: 01b4153aacd7bd4ab12dc2b6cf91ac6ffaac491c1ab1b92067eb2ffee81d95c9
font_02_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1