Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bac68a1cebabb1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 18:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d5f7313dac1fe07e2eda5f29a885690 SHA-1: 0c9c58cd269ce5851ad71bbe72f9163726428bf3 SHA-256: 59bac68a1cebabb13528e0668379158c9c4f73b383c32c5bdc9011bb85dda930
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gencerenerji.com/resimler/files/wegex.pdf In PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/kimuvapusitiwapopidigi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613665946eaaf---rabubelajojulepisol.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/razukaxesoniwivemod.pdfIn PDF document text
    • https://designclarf.it/file/rejarutizimomese.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/fodegobenagusubowigow.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/bukakopoma.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/48341967273.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/62242245378.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec7a5628f6---bemobikomivumizoxuf.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/47174438901.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/57973060965.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hnjj3ppn529r5j321vrdo2emm4/gijipogezabexob.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/vefafimulixabajegarusi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/45323941816.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/zesojipede.pdfIn PDF document text
    • http://thongthien.vn/upload/files/99671674263.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lazulelugubodude.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613241393abd1---85022381931.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/29924148513.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rudabuka.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/80942749726.pdfIn PDF document text
    • https://mackbeks.com/files/file/32760935572.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/22154414146.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/kapeliw.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/walarebemosedixobuzuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rapidex+telugu+to+english+speaking+course+pdfPDF 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_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 18272 bytes
SHA-256: 31a4fb68e82b97782afe988705ebe44285b80e0a98334598da3b256a43f8ec67
font_01_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 11236 bytes
SHA-256: 662088ee117cd2ab375ffbd278a73176172ab253a59b11257d13c82ad9da491d
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1