Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a48d57b82dddc7…

MALICIOUS

PDF

135.6 KB Created: 2021-09-01 14:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfbf0066530c51ef89183cee5be5c4ec SHA-1: 6f24f1e7373d75941ffdded0d925cc1b517e52e7 SHA-256: 35a48d57b82dddc746c3a2222b68c6fb41c5c1fdc627621d0e3380fa72c4655d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of these links and the nature of the hosting indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec5399893---27270736934.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616ce335f8---61988647077.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4a66e4480503a517fbb81bafed1b648c/xifejagogimoxudazivetu.pdfIn PDF document text
    • http://stevis.cz/files/file/25494778286.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/wenuzasojusuvivosegav.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/gigejaperigalujonirukum.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jitit.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gc69392ibua1jb3183gi1a2ie6/13449118301.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/fetepafimovigirujopo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc6af6d268---gobozakez.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eb4af80ca58072a262fc23c2ec56998/96253661486.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/rijudikatov.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jufono.pdfIn PDF document text
    • https://shibbirs.com/media/files/solusumonotoxabigaxa.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8spft4eunjbn419hp80ek450gn/rusezi.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/ruluboratetavero.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d2683ba---sipuxojevevatu.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9c7f204850c03cc6f72c694535199c/moviviratul.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/fesagaxulorokavadimil.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/llmkb23sbeuk0qp4a0shp3nogd/kimipedolajinipix.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608734f2930a2---bemezem.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dutosugexifegud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=prentice+hall+world+history+crossword+answersPDF 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_off0001a920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A920 10668 bytes
SHA-256: 8aceece86e49a841b74cc56e760840061de686ab51252938c6dabe0352619db3
font_01_sfnt_off0001c197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9A9 20924 bytes
SHA-256: 61d450e65b43c22d9533c74fcdb7672bdb13be759cf730ab763ffaae86dd9973

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