Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a5ad5cad599036…

MALICIOUS

PDF

145.1 KB Created: 2021-06-26 05:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a14c1c2e837c35cf23bebcf849798b78 SHA-1: 979281df90954282c76f359a0ee5cb96971071e4 SHA-256: 08a5ad5cad599036b2f28ca743d2c8f48f1cf70f75d8abf0dfbdb66700742768
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to compromised WordPress installations or disposable hosting. The heuristic firings indicate a link farm designed to distribute malicious content, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9572

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=it+is+so+called
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961d7e0e9a3---12401067537.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e671f9dc73---bumiguvejibowidir.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad866d505a0---20840023708.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/65395488838.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/lafoxil.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/91223481054.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/57439814901.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6806e93c40---setizuzusidiki.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f3350ab6a---konuvepojunax.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab52ca411---redalanug.pdf
    • http://chinasoftcore.com/userfiles/file///xujugilifijikibogabepavot.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d94sucq7qh07nu3o4tteibr551/ramujajivavew.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/322395e4a9140e776a9984e68af8e653/fenobete.pdf
    • http://banghetretunhien.com/media/ftp/file/pemoxogatamoxakonaf.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6joc01dmg0lkm6n3sngtqvnmvp/32690322378.pdf
    • https://activepymes.com/pub/file/vudiluladetudig.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l5dnkagla6k39vokcn7c30n08j/kazaxuvonanepoxo.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210612153322.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/903de972e29dd7f89fb8459dbce9fce6/16022421331.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288630a6aa---2178508914.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b180c870c99---46397635291.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001f72c.bin
58bc5fe287b05add6ea41e0f473a6585e168d1e74dec45d47d0b51a09e620b68		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F72C 33804 bytes
font_00_sfnt_off00013cb1.bin
9b6c89beb24f9b933feec7e9c686bf0dfb7a9b374fc0971d91663b59300c3382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB1 37616 bytes
font_01_sfnt_off00018f2f.bin
d76560394495aaa47588a68479e6b701b1b256ab5edb437d6d71b87faf4fc288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18F2F 19516 bytes
font_02_sfnt_off0001c86d.bin
3018f47f0306a4b026e093be72487f52531d68a62b0017ce68def4902a3421cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C86D 10112 bytes
font_03_sfnt_off0001df1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF1B 16792 bytes

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