Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7a0cbbade263e0…

MALICIOUS

PDF

95.0 KB Created: 2021-09-13 01:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da3aa4354f3e4861bd925dec120a343e SHA-1: 9950194fe170574d55f011453a2212614db0af13 SHA-256: 8f7a0cbbade263e04f2c09d19328dc0396347c120abde9e8482df57fa85c174d
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI heuristics and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1d57daea08ea35ed7addfad9f99690e9/11847370415.pdf In PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137491a5a4d1---87406337963.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/talapavuxetejinedepa.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/boreduzudag.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nalidovaxukujabet.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613852d954b1e---fofupuvaxemurovusavo.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/35480593938.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/11285819352.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/3341045365.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/banojoxisog.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/boxog.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/4490248982.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83414dc4a---jesobidewepajer.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/ferelobito.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/xibedodigarepuzigesusi.pdfPDF link annotation
    • http://orenprom.com/img/account/file/78597355644.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/rirenapugiwuwurowipof.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/bewajopobewirofuzaleke.pdfIn PDF document text
    • http://chikatere.com/Upload/files/74422680328.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/34687668479.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613959697f5cf---natakorofid.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/2806284052.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/33717304518.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/aa30004a7407ed28692ac832fa7eeec7/59336291449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bewafa+old+moviePDF 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_off000111fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FA 10248 bytes
SHA-256: 88203ff40b8e631e12dba7e39234672127c51b8796d12e924f201edb445b7413
font_01_sfnt_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 17456 bytes
SHA-256: c1a074814497ca3139f5c1d6036bdb1b09efe974ecc1af21d5f8b57fffda03df
font_02_sfnt_off0001567b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1