Malicious PDF — malware analysis report

Static analysis result for SHA-256 443693f5fc3a33cc…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 931f61d22ddb8cdee4625d19abea0208 SHA-1: d32f7c0413fb63473824d90733bbf3d5be4efe8f SHA-256: 443693f5fc3a33cc684c7f1e2941df6d4c464f91384e27bdc1e3b8cbb4d262f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gne8n2t3fdpm688qkodf46aj4h/pason.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e59a5cf0de79e1bee808c0a9e1c313c5/sulubijefowivu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdda935ddf2---xipunefagu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/sotixeluwomap.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/bokapetos.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3be0edfcd---goxulonebikudu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/b03d74c157532000378d6acf06f2eaf6/34977850586.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4b3a4ed9cf9139c748fa41d055d7f795/64811210759.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160733d5a151cb---jajitofagomulo.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pesesukerasezogene.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/xabuw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc34e8bf5---badamev.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d02f9e9b2bf---67349736948.pdfIn PDF document text
    • http://mebco.ru/images/file/98540710505.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1tjag3g9498cc9hvee5uuaa051/jufegadebuxedekigofakax.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ba187692b0f49efa90c1014d616e3c5d/nefojuzasiroxa.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/21352618344.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/toredaguk.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/57252400308.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/niwafigaminojoxukuvomo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160925210b2a3c---25808794656.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cac008e0e---kexivomuzoravazazuv.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076172671cda---wotudepejuvit.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/44494785774.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/97488655716.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/pidofanejaxotogub.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/87469447937.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048faa242d---riledinilogetuzadenoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=army+cadences+down+by+the+riverPDF 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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 17512 bytes
SHA-256: d6630e54d1070b60ca81f3858ff28973239deb0832ac837bbe2c3402fe8d01b6
font_01_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 10976 bytes
SHA-256: d59ce67947233c98dbda3d2d6b4cb0fc1760be3f46cc8efdafb41472fddd22b3