Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20dc1349ad07bf7…

MALICIOUS

PDF

129.4 KB Created: 2021-08-09 01:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d64de79f371808da889dd5573bb6c8b3 SHA-1: e621f923d45ba9687f22ce260fcf34274cac3885 SHA-256: d20dc1349ad07bf761ae4714406b1c87f22ca611790c24d79d361c90e2e66654
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs and the ML detection indicate a high likelihood of malicious intent, likely to trick users into downloading further malware or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

Heuristics 5

  • 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://ketchas.ru/uplcv?utm_term=%D1%81%D0%BE%D0%BD%D0%B8%D0%BA+%D0%BE%D0%B1%D0%BE%D1%80%D0%BE%D1%82%D0%B5%D0%BD%D1%8C+%D0%B8%D0%B3%D1%80%D1%83+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C PDF link annotation
    • http://anhuizpyy.com/upload_fck/file/2021-5-8/20210508141758205908.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee7a85015---80800053344.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mumelinenuz.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/xitagifisuzizije.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/70387452973.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f52fc5783---dewetomulifobotol.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609892f6adbae---68306471904.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc8292d28---guvesomudija.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/zudakuzagozasemoga.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607741b36f973---lirisubuse.pdfIn PDF document text
    • http://attlas.center/userfiles/file/babafalugukorositedigor.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9qvddc8t5p2ipn40j2djt8jqh1/41442754546.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c4cee40855265af600eae96e02b5c4d9/refawuragaditojixabixisur.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/45beeeab2fe6595ab54c2c41162f2c29/gujawojubivitiwesava.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/varalelifuwikam.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/sodinafosapifu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/943885215f3852a6e2456bdb9d745ebe/64891747057.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/54615534819.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/38672168172.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/pipir.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072dcd1b6cfa---23982347754.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e63258f379---nogedibuxozodarerofituzi.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/11234729051.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f036bdf1---molumegiguj.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AC 25680 bytes
SHA-256: df88c3d422669a07ae100e4a5e54e5c8e0fb8cdf02e00d7c75f0ce8f1a0e2679
font_01_sfnt_off0001a288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA9F 10680 bytes
SHA-256: bd6671fdcbc7d5db3e8f3d99c7efb90b31487cda1d09a90c6508467d8bac455f
font_03_sfnt_off0001d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2F3 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_04_sfnt_off0001e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E860 2792 bytes
SHA-256: 7419ba330ce1d48c6b7894caec2c30ace00e83e5ecbee3f754c36674cef57f39

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