Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8d59b3d8351365…

MALICIOUS

PDF

94.8 KB Created: 2021-07-16 05:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bcefb9a9820187b17ca382e64ccbf337 SHA-1: 57f059c67b3782e0816b4994c6a472c06227377d SHA-256: ad8d59b3d8351365130142d751d5ec7bc6ab3d2bb61447109e37503e6d04e295
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=lines+from+christmas+vacation PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/u3l2vjecon7l0t6aeib6p3osm0/xowufuk.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/99487038612.pdfIn PDF document text
    • http://jump360.co/upload/files/20210707054215.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/kunesig.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/juzigatuzebavetor.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3f05b815a43e597541588879ee3862c4/3496670090.pdfIn PDF document text
    • https://kede.org/userfiles/file/dezajokejim.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sea74fomdjl6dit6ucqokc1hd2/31668766671.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/3be4b1c9ddd9412dcc5a51a26896b6eb/16073513281.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fda47bf00095698f5de479c26624c239/12756593943.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d2316d5879d43a67b71740be2f6f2a15/musizenewesupet.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nofegegezuw.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/timuvef.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/nibazixerofekoxenufa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd66cc5c687---vetadifikekipinavogos.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/96805042377.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/883eced9b7e68c56b343d64690afa30c/55547095064.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece094ec29---76061788052.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608716c3d89f3---lozinizefodupebor.pdfIn PDF document text
    • https://bursac.net/userfiles/file/gawunekitakitu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/751aca3c443f49fc10576b3fa9f35592/72213052402.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/89875075882.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91c0327977---modulidebaguninipokugaze.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_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 18240 bytes
SHA-256: 6785d1899601e388815d264370cf1a2a7d97bf0bec6f659632b02c51002b458b
font_01_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 10580 bytes
SHA-256: b42cdfd86523b2863179d7bcc4e28286ad311b950bacdaf6a377d893a97c1e87
font_02_sfnt_off00015630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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