Malicious PDF — malware analysis report

Static analysis result for SHA-256 792564597d241d71…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 09:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80ed15d4afbbebdd2b0f09d66f377232 SHA-1: a9352307bc788f668a36fb174080c1f484cdc087 SHA-256: 792564597d241d711a3f66b027d830a228c5eb24aa75dd32ecef122823440059
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://partnerplus30.ru/images/fornews/files/xesovaribekamemigu.pdf In PDF document text
    • https://nexapos.com/upload/files/55200675040.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/bulaxiruveturiwo.pdfIn PDF document text
    • http://pronobile.com/catalog/file/78855831893.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/56995864410.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/12052081957.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/70900337511.pdfIn PDF document text
    • http://dfanchem.com/upload/files/10236825320.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161337a11da462---46549560546.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/vufexapoduladelo.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/94658037094.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109041410159281.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5a0afb8b827383daf0a71dd10db9f96f/taboruzerepuvanabekapoto.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/70930446071.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/pojotufulibo.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafari.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/zaruva.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/85190700591.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zozasebi.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/rilafemadekegefisururozew.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/41735760012.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee00108504---pepisugobidovorepebiweru.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/timefomofitanazukigozeg.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/fegulimuwin.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/35163249361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=madeline+leon+after+the+stormPDF 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_off0000cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD1 19724 bytes
SHA-256: 2e36ba9f9ac366a80a008aff76bfcfcd4ad4952e8d335a914aadd88ef0993573
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 10612 bytes
SHA-256: 1bd67d8052672cefb414be6b0f8858be986c9e27c8df78543afe32aa77408d24

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