Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70198c1078b1df8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 15:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99bd2aab3d65fcf3b7556f92bc9d402b SHA-1: f419b463fb903b3bae3f10542466898f9929820b SHA-256: f70198c1078b1df8b0cc83dbaf2e6625231beb62d54301319779d353fabcaca9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting a phishing or redirection scheme. The presence of external URIs and link farm heuristics strongly supports the attack pattern of directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://amuseonline.com/absite/userfiles/file/rapufuwopefopod.pdf In PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kozoxolibudebolebimiku.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/2580421564.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/98658740328.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/50729805577.pdfIn PDF document text
    • https://htchninc.com/d/files/rinikos.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2efd3f6bb5715d4d1ad0d9a4b2621a08/vinuju.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/90e1ee67b8bc4cf906bf5a6d58cef9af/fujuvinafubavelomewuvave.pdfIn PDF document text
    • https://ubranni.com/uploader/files/87245121367.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae2aece07---82080907747.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/62486600388.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6c93e8e8---livajov.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/jobuzijovovew.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d844d0f9dd---fugitanajoranopem.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/zepijopo.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zotoxevitegavuw.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb661c68dc---86396861635.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/92744441021.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bf79816a0---puperomemulifulawo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/88523648772.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b14b067f0---79046908698.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/buboxi.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/28318566955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wow+legion+art+book+pdfPDF 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_off0000d7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D2 17876 bytes
SHA-256: f24623c2a41d15367ea488c46104bb520d2a0bbee34cfbfcb6dbe773bbddb187
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 10816 bytes
SHA-256: e25eff3e112cbaad052ac3b0830187648f0a74fb17f3181baeba3f4f3d9d075d
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1