Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f742cc271a59a5…

MALICIOUS

PDF

111.8 KB Created: 2021-09-06 08:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdde4fe52cf205b2e0525cb92f71084e SHA-1: d763a8983ce6af0bd35b28f94404c9de217550b4 SHA-256: 73f742cc271a59a5d24a4b6389c2e8fccbc5646fbe0266768da74bdc87937d57
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious destinations or for SEO manipulation purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d055a28b---82570331810.pdf In PDF document text
    • http://cheumst.com/upload/fckeditor/file/nulewa.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/xikadetigezire.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pimuvozavuxalanexerir.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3d514588---13708099513.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/95047423354.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30129238270.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/34475185731.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/11621643937.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ltktl539ba6b2huhup3chllv65/87251130806.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bobutokefefelafeputazamaz.pdfIn PDF document text
    • https://phr4u.com/files/85672059573.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610adfbebdcc1---fizeno.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfd508b35---79452693288.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608603775a689---tazanotudabekix.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/79993556417.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607798c0cf437---sililo.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210716033133.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/6bsv73h32ethp4rj2np12rnfu1/19363138511.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kirasadafabuxina.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/93707604fe4b8c62de50ec9dbddcefa6/94775346871.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/xepijufegogavov.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/2270145105.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7f548053---tesivumavojizugipufig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=class+10+civics+chapter+political+parties+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_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638D 19588 bytes
SHA-256: 6461c1a4ba62979df5199350f1c1fe29f345f0441d763bca567a3498df5a99d9
font_02_sfnt_off00019768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19768 10884 bytes
SHA-256: 4682b0e325be2be93b8beb07bbdf3ca17079b283082fdbc24418be9c3d10779a

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