Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0f45cc107f1526…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 11:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7841b58ab62abe1973cb7170613204c5 SHA-1: a79a04e0d74a0d355869e1f0c2765a7e6ffff305 SHA-256: ab0f45cc107f1526aff45122d2fe08d1acb9427ebf5009a8f604cd2063197919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://amsasecretariat.fr/userfiles/file/lajunomawazubawogesanozi.pdf In PDF document text
    • https://sthouseluxury.com/upload/files/sadiwuw.pdfIn PDF document text
    • http://vitrine-prof.com/files/sobimawujivisovebenoruzo.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/53018206935.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/rovorazuzola.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/1374725533.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/70311769384.pdfIn PDF document text
    • http://4darchitecture.org/img/all/61624032481.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/ragigasepav.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/72443470705.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb1b413e0---muloxosonebixakezezafig.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/49479503463.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/45108227134.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/8583753179.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b6e9e1eb8ff1a11a152f302cf76e691a/52845226102.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/79392571555.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee272883a---febonekop.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/11507515022.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/disisamurujejizumuzoni.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba5caf6c54ec99b148063b68343837dd/gepixepotet.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/15858458233.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/biduxelaper.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210905211349_lpone9.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/91434531539.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/40482234043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+apps+on+androidPDF 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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10596 bytes
SHA-256: 5f44bb027e18cf55bc099588f0c778fc43c3bc1e105c49bb0b9a94dc51d6ef7e
font_01_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 17732 bytes
SHA-256: f10256e53c396d44323fa5fb4d8cf872de10cd292ff931a562cc4d2644025034
font_02_sfnt_off0001303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1