Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126449a37138c04…

MALICIOUS

PDF

92.8 KB Created: 2021-09-05 07:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 59c0036ab8e524b2390d4cb72ff447c5 SHA-1: 1cce8b6ff1333e6044aef117331201a7e22dcab0 SHA-256: 8126449a37138c04213093ff9a24678ff63108b2723b6707e0118887cd657b39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9965

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://wastran.ru/uplcv?utm_term=moltmann+the+crucified+god+pdf PDF link annotation
    • http://signauction.net/userfiles/file/safenuzakeworaludepitebox.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/febotab.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/24051424667.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/20839694764.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/balusevabapaxet.pdfIn PDF document text
    • https://castel.ro/userfiles/file/tokidoxiwup.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/klumj3m5agudc60mq3opc09vf6/napasirebosazujedago.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/490013081242e7a31fbd1525642f4f50/40337310193.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/loliviboxe.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/4387620300.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/roneb.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/zinubu.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/sulubobagunetaj.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9a89f6fadb5b94da76b9b0e25e6023e2/21340730252.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/wobaremabowisevoxitobaf.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/34314633385.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/72586100961.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/juxizojazaviwokixibo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/98ae6b83a1e08062200b6e6c75785729/30525218806.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/751dfb195e3c110d385454880d687b43/dudexixedutazavivo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160756eb3c7456---27359331064.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fovepijasafelog.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/kafulalupawe.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/weporameludamiwimemurod.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_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 10992 bytes
SHA-256: 71073794acf230ea5e3ae6acb0aef32e347d8c36d80b83041db559daf6e8d196
font_01_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 19732 bytes
SHA-256: ab6b9cafecea8bf9c37e5b8d4395715cac01ef7474ced1e7ac97ca50a6f8c68b
font_02_sfnt_off00014d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1