Malicious PDF — malware analysis report

Static analysis result for SHA-256 711d8858c1855708…

MALICIOUS

PDF

94.7 KB Created: 2021-08-21 10:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb28f887be83463afa4b06b8f04f78c1 SHA-1: 94492518c5d3483a562832daac8860e6ec4364eb SHA-256: 711d8858c18557080b5e04e37b485ca50db37e004dd1412e4e72af505f7ec963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drafthe.ru/uplcv?utm_term=prueba+de+moser+para+que+sirve PDF link annotation
    • http://debeleven.net/UserFiles/File/67809811934.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9abcde225---60849858610.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mufej.pdfIn PDF document text
    • http://lblussana.it/images/file/kigamuxumonigud.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/78159304110.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fcd835adf0ed5927c22e7f40801975a9/37705463213.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19bb36bef---39198435565.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/d2d14d868d4bda77ae41f80b801fc4b5/mibutus.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/gewulepe.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e96defa4a---64131139856.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/18272089021.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/67509282676.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/75416392012.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e83072575ed---jebujixebeluta.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/38064575764.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/60732041889.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/071b87820fb1cd51e294a1741cbe63c3/seximemibeloxulopepuxe.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/htc3tj1oo50ns529per19ca2d0/40456503275.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095549829178---nuxubinujizid.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nakufonan.pdfIn PDF document text
    • https://aspirans.com/files/file/25135464141.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e128cf04607f4ae115bd5973b8498f7e/43615160481.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_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 18756 bytes
SHA-256: 298a0354adc67b8e0538a42d05acea8fc7f778c4ec27e7423affff15abadd8f7
font_01_sfnt_off00013a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A01 10760 bytes
SHA-256: 6bbe0221c6f4ebd98ac535c94267d5df449b122aa1e5baf8f5081e2e17996eaa
font_02_sfnt_off0001525f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.