Malicious PDF — malware analysis report

Static analysis result for SHA-256 24975eb53d812655…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 06:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c377a2662cc5a75274f7aef40a5bb40b SHA-1: 817bb7fc513583bfd8cba91710beee03d08f979b SHA-256: 24975eb53d81265578215d128f145d1cbd26e9853f7022a244b064db0412c7f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to leverage these sites for distributing malicious content or phishing. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://samuelben-horin.com/userfiles/file/kinebigutifenujugavar.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302075d00d7---80233668743.pdfIn PDF document text
    • http://getvisa.ru/images/File/xuwazozemurodusob.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/gelep.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/29273952399.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfe42f657---gelarowunoxepaxibike.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/47387897395.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/javazisixewegudurabumosu.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/21256814953.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613689f214d3c---33010278616.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/44127305081.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/vuselafegujepajexudiboj.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/niguniv.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/72033000996.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/50852997877.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vs7dddj9csh6bkkeuvjsbqrg0s/51820272774.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/dofazezisiw.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/puzosasagilesi.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/79271107990.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf6275627---paxutuzole.pdfIn PDF document text
    • http://hkacca.com/userfiles/vazugaporogabafonizol.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/birunugu.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/22659552219.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/1842194257.pdfIn PDF document text
    • http://webbuilders.com/files/file/voviwogufokifij.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/mizajagogoweleviv.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905180225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=guardians+the+superheroes+full+movie+onlinePDF 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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10968 bytes
SHA-256: 4147a79715d1cdf509ee5ee62346ff56a04103510a415b13d654580a4c7d3512
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 18380 bytes
SHA-256: 3e71790eed35a4bc50d41efdc6943fdb6dff2d5144a5a646587f521a4d353fac

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