Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c8a959c36e8aa9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 20:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cfe33605e504e2a530b7e7b35c9d12a SHA-1: bce5c3c44fc7b4b256eefcdb18951eba5908b0cc SHA-256: d4c8a959c36e8aa9268815041a8ebefd4096a5acba4a9bf4b6acff2e23405194
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics suggest a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://flirtproducties.nl/ckfinder/userfiles/files/37565349232.pdf In PDF document text
    • https://ccaquebec.com/userupload/files/pufotemuzofikaporodusam.pdfIn PDF document text
    • https://tch.lu/files/files/52276690563.pdfIn PDF document text
    • https://landbar.com/upload/files/bovapa.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/fijaxaloxenok.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/34729335468.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///semafoxokudegesepawonire.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/petag.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/17806944230.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7a3cd4fb---41658396186.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/h0s6iaqs2qsgv048h9cr05eakq/13732876088.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd423b1e5---bejowijepi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/favaniruzawezedefirimavur.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1ffd135b683b2a4b347651d6e665f3d3/58861658947.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7f5aff3239996512ee3de4f34f8eeb36/1607732854.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/37058316842.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/11328751463.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/n62rph5thp8perofv8u4i984c0/wejubidodebutun.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116dd6351d83---kusoviburugalupewudaki.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/9163341139.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/68656828643.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/gv2cp062jfujrl21924a1qiq57/48187435698.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210723223716320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=dnd+ability+score+rollerPDF 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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 18744 bytes
SHA-256: 8c57d6c3467289acb9f6097b2a500027fc8e4ce9f651291ad7fe5990ddc1f702
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10620 bytes
SHA-256: 9fea2fca8b86d58a79ce8f5e86922d8ea783720fc7b9784f4716aa91b2a144bd
font_02_sfnt_off0001301d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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