Malicious PDF — malware analysis report

Static analysis result for SHA-256 542672b34c4c5d40…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 00:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ab05e7c07836ef9c628382bd09d8692 SHA-1: c5b49c055c467534916a9e8c8ed5075ed1c22d33 SHA-256: 542672b34c4c5d40f68055d71e3e178629de4b6f4739f4d8daa0ae0cae72e202
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malware. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to trick users into downloading malicious files, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://snapstudios.ca/userfiles/file/miguwa.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021090815323637.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0d102584822ac3062c4a7349012c0098/xuruzasumuzepajowenimaxaf.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9abb9273---kitizumuteza.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/pegujavaxazodikara.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ebecdcf06---pujeguteneragotapor.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/40060837366.pdfIn PDF document text
    • http://yoron.net/up/files/72311360796.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/zaxubesijunafawugezuwuko.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210903084448.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/6668159148.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/64919000838.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613feb860f50d---46520385248.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145f03655972---majerimopidizawudofo.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/lafeponomotodesefosa.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090322134273499.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/nojolafaxosodefalazotive.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/mukufabilevu.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/97398817250.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ee66f1c27603f50dd17602ef2c6a3019/95988231244.pdfIn PDF document text
    • http://tcihk.com/userfiles/27941033336.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb047c3c0a---pofobi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138960b1607e---73251545651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=properties+of+exponents+algebra+1PDF 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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 10828 bytes
SHA-256: bff8712058d2ae589e1951587048193ab1fe223c70eeae220dd9adc0ccd25bec
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 19504 bytes
SHA-256: 6bfff14f6939846dfcec0e118dff68a98fd0b29e77e26491bb57a94fc40d7b15

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