Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aca9042a57f1d2…

MALICIOUS

PDF

92.0 KB Created: 2021-08-07 17:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1208b8026eae8903d87923840de4e0fa SHA-1: bf123b588cd81b26a0cef37092579094fc8fbd31 SHA-256: 73aca9042a57f1d23d4636a6756f9faf55633f19a25d203dc2cb1565d41a1541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://billedbutikken.dk/articlefiles/file/rabetonani.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/janepererew.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210518194429.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/90517666556.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/8444620295.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gowipavanijubogar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610dae285fa00---15599502357.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881577d95ad---dokaximujizavemoxi.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/66909069681.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/nukik.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e48f2ceb8cd528b85e762ea77e28ff77/40773266924.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/mogitulolagexutuvewojuraw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/jntkbnsp7c7sh37i3otv1cp8us/91147528557.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/20754613816.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/24078889356.pdfIn PDF document text
    • http://stasta.com/userfiles/file/kufokunade.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b96e77459---negojozagunozenidiret.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b06e8d65---39443408826.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/keliv.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a9fa2eba---29217038307.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/rojajaz.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wijawiputa.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/9476671713.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/33814481880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=malayalam+songs+zip+file+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 10996 bytes
SHA-256: 7b7e75cd7e2526c0675c194b14fce3578afa2ece7dedcf058808f80c4953008b
font_01_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16060 bytes
SHA-256: 79f27ef1bf85ca6c198d098614f2f622ee7798d500390a76c2468bf998b64bfe
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001334d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334D 17848 bytes
SHA-256: fc2d414eb806df4a8aa723d1b1485b258cccc332eb504019838771dd2beef11d

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