Malicious PDF — malware analysis report

Static analysis result for SHA-256 810d3a25b7e108d3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 17:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d735e3a55a6f8b74dedc1c1eb3be794 SHA-1: 48dcb8eb25431e3962ca2fdb1a164e1098d449cb SHA-256: 810d3a25b7e108d3e05c7f3ce0f01e983c80c5284c268a8e9e5db4114e867bcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains a link farm pointing to numerous external PDF files, some of which are hosted on compromised CMS upload directories, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://neurooperations.com/ckfinder/userfiles/files/saxupuromubaf.pdf In PDF document text
    • https://millinerandassoc.com/files/file/popuwix.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/rubovazefiru.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3ebb58dcca17f26fc1eba39ac88629fc/76343922624.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/kibizimogotixozon.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c502c6478f---raxanebozoxefolafe.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/xevodebedu.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xinekidivigu.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/80433676530.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/dojenul.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/ruwowedokemegidufawo.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/32740352971.pdfIn PDF document text
    • http://knauto.com/upload/file///zunikelarit.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482491b48eb---tawokofiw.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/posofobazanuwosav.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/9988403856.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/98157047083.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kutusazemoroja.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/nojibo.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/468183421.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/varadobodivukisarobelabod.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/37874774601.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141f910a5aab---jiremus.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/2572369526.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dvu7p9m755du8p8j3dsoldfl9f/25521664221.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/35158597415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=please+temple+run+gamePDF 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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 10484 bytes
SHA-256: 7080554cbc18049db89b2b00c6d0b5a625291ab6a9ab584bc23d95a63d3f20a4
font_01_sfnt_off0000f64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64C 17952 bytes
SHA-256: 313584e92cd3b5aec33a976b8881761e9ef62ce99f7601560b3cd4933fb1095f
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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