Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46616190e22b422…

MALICIOUS

PDF

91.5 KB Created: 2021-10-19 04:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ed682712f1e4cb0647365ba52e27d8e SHA-1: 9fa252da0e466d7ecc126d46061d48bedc36a977 SHA-256: a46616190e22b422af184ee0df3b7263bd5313e0bc963d643e627c13c9105fbf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically generated URLs and a link farm on disposable hosting. One critical heuristic points to ClamAV detecting this as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://naso10.com/userData/board/file/79518806508.pdf In PDF document text
    • https://hoakhanh.vn/uploads/image/files/53404990979.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091906554573499.pdfIn PDF document text
    • https://signika.pl/Upload/file/59987228291.pdfIn PDF document text
    • http://healthywithhart.com/res/file/moxadexebugovegitubotel.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/a1fe5m196t9pgd61kkagknb3q2/7640171025.pdfIn PDF document text
    • https://afma.pt/site/upload/file/24173400387.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f10c20cd9fa3630c5c0051b805bc01ab/jabeta.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/janokajuzef.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021101613270473499.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/nutovaralokero.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/51441519167.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/nudojowalebaxikumasisolit.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/24053730562.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f565130f08---ribezoxolawemalinag.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/87468564962.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/34038148451.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/7982124382.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50990059774.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/ginobeturumotedipu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/fumosogukusumem.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e7382735d3bbe1afbdbed082ddd18a8d/14353117981.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613895fe10b3b---89111325116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/896FEnmJZlk/uplcv?utm_term=curriculum+guide+in+tle+cookery+pdfPDF 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_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 18532 bytes
SHA-256: d58d25099d2339466bff44a447fa1b1341ea9538641ac24a85f784e32cd9a995
font_01_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14734 10968 bytes
SHA-256: ba13d1a562502d2bac5f422e5f2d9f9c1b31b55c4e549caab6255c45cb523e68

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