Malicious PDF — malware analysis report

Static analysis result for SHA-256 591c015d776ffd40…

MALICIOUS

PDF

73.9 KB Created: 2021-07-09 01:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4355dd2ddfa9e6003e5225aa5be82216 SHA-1: e8cf8b559eebd3fb855dbd2535e7ddda0f0ca180 SHA-256: 591c015d776ffd408f211167e880fb56776163c7e79b1a75d0a29f53078168b5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4e7f9a4c8c58c8b8f6df3eb8367dd163/27752148604.pdf In PDF document text
    • https://aldurra.ly/images-editeur/img/file/3111911953.pdfIn PDF document text
    • http://elm3rad.com/file/natoxap.pdfIn PDF document text
    • http://gptools.net/userfiles/file/kutozafedo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e38f655c978---89888366818.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eddef0537---vudefurosomurozoru.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9e2153c3eb3ec468a554ddc94af3c206/19398828725.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ab481757c468579ac35f2ce75bc8e0e/68528755228.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/zejoporimurotivob.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/4go81ol3oiv4885shu3dcj2uns/vujawunesosime.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/41e70b672f930ddf66daa83ad1440621/43025761281.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb8b20a1a4---zeminirubozorarixikuredus.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f71b9bd5bc9d92ab18fa6b519dba8bdc/tezefakazuwerizofeba.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724ec829815---7095869731.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160823710f20f0---23883387808.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b5f54f9f049fe2c94436527aeb5f1d78/21631705059.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/16283215015.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/42692768333.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbe59d2e0---genifiwabel.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/veralafeluxavijonubow.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/90f8a38b1c3518ac529d16ae7c227fb2/57124122101.pdfIn PDF document text
    • http://yuhongzg.com/d/files/72492282396.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b311076d440---20569612098.pdfIn PDF document text
    • http://jaatkinson.com/userimages/56563990766.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/zuxeraledo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=past+law+exam+papers+and+answersPDF 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_off0000bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 10528 bytes
SHA-256: e114ff6fa741ce3623b23e84a6e0fc13bb31ca1d480add083880178090d5775f
font_01_sfnt_off0000d6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 16548 bytes
SHA-256: 082522062641a987421ba6de97af6019fe6f9a1c1b9816c0b0844978dfbee425
font_02_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1