Malicious PDF — malware analysis report

Static analysis result for SHA-256 318936e53ea01c14…

MALICIOUS

PDF

103.5 KB Created: 2021-06-30 17:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0710f69cdc6163e7f0d0df58a0c3f7a5 SHA-1: 0ffbd617b50cb6a4f0f788bbb5bece1dd156fdb9 SHA-256: 318936e53ea01c1435671b0e5c1742b94177edd1d097d93b6098beb5e0ee5eca
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8b72a8ed05f2737bd05f60f3d139d9d3/28410390915.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/71fhhp09vqdv7m9ea35lq0ogie/72278605628.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b773188f295---bagexibozu.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/welivufexopuriko.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/11865905678.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c5684c34dc5295f17a534a561009944e/wivefadikitogiz.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210524013559.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6286f4a4---pekotezejezave.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/21721069849.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gi1j1v305red8jqlvq51u1kkdt/53842257493.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/21988581221.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fojofiva.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bin0cnntiv6i4u150a5r8pj4e1/vurudas.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/dusagusipatelusex.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/36975217855.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/pelunidagelofipifunomov.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f71b3727b---fiwerofalojebufurazavox.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6a0d6ec56---jotuwawamilozikowene.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ec4de31e12f1e0863285c27d86dcdd38/86378332069.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/4uaol6g35k5ape9umh0fd23gov/mijileneluzufodezuge.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072077b5eb96---842019366.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/oi5mljfskk9n0r617ositgcsgn/nonuduzuwodiruxaxamojejik.pdfIn PDF document text
    • http://fittbikese.hu/files/file/bezox.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/5b797517ab10caa3d846b9b89b650bbd/dufefizufitepige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=community+mailbox+outgoing+mailPDF 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_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 10536 bytes
SHA-256: d4d268f08763af6f0382f6dca8b63a8a47b3d26f9e8004489d0c741d19dd0131
font_01_sfnt_off00014997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14997 17960 bytes
SHA-256: 0523aabae1bbda7ec765d30e42dd0a9dc830e1a28cb2ade01ef0c4b6c03ab3a5
font_02_sfnt_off000178a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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