Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffce29fbc5075fc…

MALICIOUS

PDF

124.7 KB Created: 2021-07-17 04:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d335011d5b13091f45fd2dc3f5842a24 SHA-1: 81aa7fa11be4abaaf6935bf2007ea673990cdf64 SHA-256: bffce29fbc5075fcc70205133524bedbb5d4a702fdb0f00567de40e56325b4f0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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 http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7da571b2a---lomupifafurob.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/49a146477aff73d6a831a28afd1b93c3/19401070280.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kojabipageguruserivabebef.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1666f0ab---palasedati.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f0494d8a---liguzixaxowokatatak.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/12299192817.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kakevesagosujur.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f21ed8ec2e3---30175301082.pdfIn PDF document text
    • http://yjccnc.com/upload/files/59541374018.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/joxunosovupesabasojovex.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b0528ee7843b6352a07191b8cebe30b7/56558399709.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c90ea8e6---jikevenotugavowu.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/65a2df90347cb0cd4e81abb4179c6e6f/50185169012.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/lafomigabepazitulo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b027adcb11038d0f1aceab518e5caa97/97621562543.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/23503725727.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95cbcad4ea---14355355548.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/jatisim.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/76341438236.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a140487513f---welos.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160736d9bb17e3---vifokovimamopazogafafa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb724df48---33911476565.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/wexukukikimazivepuk.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/63965949102.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80448b9b7e---29664128312.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/16209476385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=giselle+and+tom+bradyPDF 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_off00018099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18099 20472 bytes
SHA-256: 7412209048659c9f346e8c3953fc4cfbab116afb8b5e2d5d1948ab93841b56a6
font_01_sfnt_off0001b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBBA 10704 bytes
SHA-256: 23cf7cd8ca23c57062b30e2c872196e2fac0ac78e1216e4d59667e7342ef0aa7