Malicious PDF — malware analysis report

Static analysis result for SHA-256 1654c8403145cf64…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 17:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de3f55c9727f25d4788c0497be684f0b SHA-1: 3c17b10557c5548b0b7247f2e5baa55fa236210c SHA-256: 1654c8403145cf64fc192ab7ca2dd188f18780db6c2b2a17ba051923fbda759e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://namratalakhotia.com/userfiles/files/54980524505.pdf In PDF document text
    • http://www.monts.sk/upload_images/file/nijerajipuvatufazolidew.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/52783681814.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1525485642614010d824a18.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/guxukiwigasosumaviwi.pdfIn PDF document text
    • https://jetaime-shop.com/files/83296612428.pdfIn PDF document text
    • http://szjg.hu/images/file/72859653425.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/bopunazarugewuxa.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/90933699082.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/kovexipejinezin.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/44379111735.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0f9f1f9c---fozotanazigen.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/lalag.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/zobevijerasobebug.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1896501953c5b9d1a58227c914701e8b/40091065605.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138304bb05ea---57308811080.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/43043603753.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fead1bd431---ragexas.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/3843392498.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/24679928355.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/zixevakobafuva.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/16028426668.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902195721_640555.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/37460388007.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/94693610725.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/pefusen.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/rixebazizivubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+auto+3+apkPDF 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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 20480 bytes
SHA-256: 5bd54e24697b36d589852d191466586f71de61db6ce14e1a56792e6bc9d21767
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10008 bytes
SHA-256: 499029634a1481c3b13e04dcdc0a201b1cea56bae05cbee91cbee04cde599716
font_02_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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