Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3b910789d547bf…

MALICIOUS

PDF

79.0 KB Created: 2021-08-21 20:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb1480018c13bc865af05e75cd107113 SHA-1: 7e69d6baa7fecc766b12524ac84431ad1b1561c1 SHA-256: 9c3b910789d547bf16910ee7badc2db1a616af2a691e9c8d84047ce1fd78e921
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The presence of a 'Password-protected archive handoff' heuristic strongly suggests the document is designed to trick the user into believing they need to decrypt or access an archive, likely containing malware. Multiple URLs are present, some pointing to compromised CMS uploads, indicating a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://monyetmesum.com/contents//files/pirugigidudomarexu.pdf In PDF document text
    • https://serwisnawigacji.pl/userfiles/file/tanusugejuzumoti.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92873212158.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5fe0f188f---79089532970.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/fudibaterigoloveganujen.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/jutasijifivot.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086b876dafb3---zulafopokorefoletone.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/45720737354.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/54062654100.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/27406663255.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c7d272614---woxutijutunuwifavapokemi.pdfIn PDF document text
    • https://peterdegendt.be/file/90942067803.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/33893309613.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/9576822736.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07ce76c61b6369bfd704a4965ccd6375/53273187086.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fec63392---gujudabu.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/gafojowifarapuw.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/wizugoxabuditufoniv.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/k55ffi6qhcm08cgd6b6srm1g25/nubaxovipuzovidexe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e8a2124e5b1ce3d725547f3db9a2ff1b/pamubuzorozajosakuxolutoz.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/90238488394.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2172746592.pdfIn PDF document text
    • http://erpos.sk/data/files/83949442926.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/lezanadinuseripinutiketor.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/14925832410.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/sowiloz.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5421daa6---pinavageratilib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=realidades+2+capitulo+7b+answers+page+145PDF 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_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 11496 bytes
SHA-256: 81a297fa0290c8c2d22d1935ba7c17129b71b75617a74c9cfab42f3ccf39d28c
font_01_sfnt_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 16964 bytes
SHA-256: 479d22ce067281b214fdb78fa61f032278c3d258d563a5d2494b711fdae50db9
font_02_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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