Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e10d619d63a11c…

MALICIOUS

PDF

103.8 KB Created: 2021-07-03 15:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 271e21d4eeb1f3398178ca7b3d27ddbf SHA-1: 70d5f9061784a81bbbb8c3ad745dee2cab00f6dd SHA-256: 35e10d619d63a11c68f9132f31e497858c635b8b1579ae5ba91d81e2972544ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://garglob.ru/uplcv?utm_term=back+pain+before+period PDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b9cca7a5---siwomitazixuzebilutot.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607970a34ed95---71696758608.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4a65cdf7---vimesufubadukoz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0frda5u6pof88cltfd89vqh9q1/bulasesopi.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a280606d1d147dfe6e198702cb39d547/fipega.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2685225ad0---namitogozebowel.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc268db886---xijexixil.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a3cb5b07---70347267278.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/10586c15325e2d771cbfb1ec503f2417/butijewufatigizijolajekun.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/rarefer.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2c2c676d8c6cafbe0838305ff37460b5/33964408690.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/26893627700.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qkk2n2c96t4gff7ji6ttokvjuc/96118009022.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8cae607d---90851677582.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210516065733.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0fe1e6f28---77656754407.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/sulosokozapumewopufukofuf.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/75277103811.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745ead176aa---84692929868.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6849f7bd0fabe3274ce55bda0bc20f5e/xatujepupifo.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608495de2520d---510363437.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df5e33cf4d9---22661924611.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pfgupkg9nho7cv8dblurtr6b3o/86148771788.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a55b15fa42625da826800e75c5b543/zekiwidiruruza.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/66986372814.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/babirifi.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_off00013719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13719 10584 bytes
SHA-256: b3c17f4cbb7411f3c728b7dd80418e37203f6d79c540f2594471c6a253c0465f
font_01_sfnt_off00014f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001673f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1673F 16464 bytes
SHA-256: 70e85a9ef8fddb3bf3fb2e69d042f98dd5a4f07124d7686b9e8e4db8a2edb2e3