Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c0ff00d585f812…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 20:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e91385b57410aa1f295e4a13a009c7dd SHA-1: bc3560794c4a5aec1b757d7ecfe511ffc58aac3f SHA-256: 13c0ff00d585f8121244537709848555d094cdd558f195e92c8276fb4b3d5968
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a likely phishing or malicious redirection campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=rfp+response+example+pdf PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160da624c63012---xusaxerupofun.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jupozulezipuwuwulifotazu.pdfIn PDF document text
    • http://asfalon.com/__files/file/tomiwimaziw.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rasuviwekuvadojonaxedu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/948d84fa60dafd46a5f9a772520fb891/somugedulepigenozoko.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/ratasakupowe.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lusipasabusexezoka.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e4fc507cfb325f0d1f775cfd78b6e62d/22482811161.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/54cf8f14d2379b127c78e5fee2e4b84b/71775487368.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/88202134753.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/dunuzowelupexe.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/getuvexavatojikumezepanu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/92468481032.pdfIn PDF document text
    • https://dhesient.com/media/fegikabagasu.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/51774072787.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/bemefovurebilofoxagixamox.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/6614976175.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/76358915065.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/65744544865.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/nirafobovekoriweliloke.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jusoxetolep.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10616 bytes
SHA-256: 51552f2b5e22ff500b4ab1423a454023fa227110aa112cacdcbe0fd207fb55d7
font_02_sfnt_off00010ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB0 17644 bytes
SHA-256: b166a0c09e8bca31c7d8f891f2f76bbbbac681ccc33c9dfa279797757b4f0b50

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