Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc67b60fbe6ab063…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 07:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fe6539bdb4c9d96fc32cb2027441bc0 SHA-1: a20c2174e60ce2f144ea39db5ccfa0d33c3f332f SHA-256: fc67b60fbe6ab06387aa0173104e91955c6f2e95da981c8ca38ac779a04955f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest the document is designed to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://autosoftware.company/autoresponders_images/files/sesavudavojawulebemogafer.pdf In PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078adbb79a0e---51611268145.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/41673654669.pdfIn PDF document text
    • https://angkalaris.com/contents//files/90385999982.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210703142838.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/sizifidunelobapojujaxipi.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekaxuzowusubam.pdfIn PDF document text
    • http://fitviewer.de/files/file/66394881454.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/34028658557.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/pixuniweposikeluwipuf.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/posenimolutobatafemoja.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/papagitemeli.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c392e531eaf7163de459f24accf1926c/pazojamunopetujo.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/66023613092.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db27e89b25e---76752466563.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/33cad4c6ca500d031c546d71adf97c66/xozisibepami.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/sumidatu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/21328632213.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a74d682370---sepof.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160def5d54bf18---3297288614.pdfIn PDF document text
    • https://fultoys.com/userfiles/ziresarolizimakawifizim.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852318badd8---bozepukofijo.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/99599228883.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c0cde416f6a21a48d2bdebe0cc364715/66776569529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=old+inferior+infarct+on+ecg+meaningPDF 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_off0000d7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F1 10676 bytes
SHA-256: 7510758504edd44add73603c9905c3cea0c17a77f87ce479d9c8949b81429723
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 17924 bytes
SHA-256: c0900340f1e96050cc079a4effaff0b2e37014451686937b763a351a9b6d22f1
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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