Malicious PDF — malware analysis report

Static analysis result for SHA-256 6742c55805dd0ef7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 18:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 495675b62a3816973147e434e8b0e268 SHA-1: d655cd5647d5dd9986971e50559304a3ad02f784 SHA-256: 6742c55805dd0ef772a0c7c6b8a71fc26068864dddd42ec887bb44361492161c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URLs suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=multiple+intelligences+gardner+pdf PDF link annotation
    • http://anandtouristcorporation.com/uploads/95832745636.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/sotorasivuze.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/af82d47c7dfd0037c9eb908d7a4f5b8c/74878786824.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/jiwowivirafufenazasire.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/63323561899.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a641b08798---vodolilejavaxege.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4315a9529---dufexunudelasupa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084753e470ae---lukikerozadomi.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/86667990573.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b2c41096---2211587112.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/16331159808.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809f1a6e205---mudojibawedufusimita.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/59506081433.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/38997430706.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3801360a6347ee8327b0c7cbc9371c02/nevev.pdfIn PDF document text
    • http://dbhsreunion.com/clients/21010/File/89018162462.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/lulopupagaralosasazeza.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/vixewixinogunukemotinug.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/degesewumofogok.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc9mnsa8pgdei31lumiju0h1k7/koponekidepibikupul.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4naqkss6pobs09qh49dr1cp5ib/72341894456.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16114aec62dcc7---40969083439.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kanavemorololasabumor.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_off0000cd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 10768 bytes
SHA-256: 049e59a39e5476a72bd378d0d183dabe39e9264e5a004c9ab26c00ab8df55448
font_02_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 17444 bytes
SHA-256: 4373cb4b3a5a9344098a5d94224fad630e81cbaa3dfebdd3ec269cbe42ce83d0

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