Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaf1103fab20062…

MALICIOUS

PDF

88.4 KB Created: 2021-08-14 13:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b9fef98f089dc67bca840d14942bb78 SHA-1: 1793c7f4e3375e59d46597df6d2b3662770a7b99 SHA-256: bbaf1103fab20062938cd1ec4010f5e00e65c7b98cd9a83431015bdbc0315c96
104 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it leverages compromised CMS upload storage and disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an intent to redirect users to malicious or deceptive content, possibly as part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://fusheng-vietnam.vn/admin/webroot/upload/image/files/kidijawuduwanenewofeze.pdf In PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/6fc371e8075ed98f3c2b4b72c3159403/7310984901.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/6548448013.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4856196c00ed40378d8a3199c3570b04/wumepozizog.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/xefadabinaxafokoliperonu.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/61287238785.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/67333525641.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/gomuxerirarasofos.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/bexamatuwefarilo.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/37b55846998189915e05c7de3ba0570f/pugukelovoxelenufawa.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855880ea518---48720425690.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da040bce9---dulowizogerugot.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/97224468776.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/tapimesugeguridazadif.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/zolejudupefuxuxemaporoma.pdfIn PDF document text
    • http://screen.by/images/file/xamunobidugatedisijek.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/25639273565.pdfIn PDF document text
    • http://isvpro.com/custom/files/babotuwukuv.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/98473399751.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5727abc6---wodumomama.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/55a67120b4e6c7de7c16e2184bc439a5/84741396262.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/db4a8f5263521d8512acb2a4d154dcdc/60033986745.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/3906427056.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608954c6cb25e---42786813648.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7d5d9004586ce865460bb98cfd68639c/tidakezevumemakeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=qualcomm+atheros+ar9285+wireless+network+adapter+windows+10+hpPDF 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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 18588 bytes
SHA-256: 3c40674848532a53efd74059ab7aff756501d4c1a0b44c9e47ead7158fa35807
font_01_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 11920 bytes
SHA-256: 4bac28f1e23cbec05abdc0f9457b914579dd9894f29ae59b8f7c8fa77bf73c61

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