Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f065e87a6d4cb0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 05:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a56ba6139ab93ad56d08d2853168092c SHA-1: 5e1f5a4ad04733557817125ad5a102908ca2a311 SHA-256: 88f065e87a6d4cb051960c661abd76cbc74ae7ebdff97c1a19753644bd2b4981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised websites. The presence of numerous external URIs, including those hosted on potentially disposable or compromised domains, suggests an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate such redirects or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://chcial.ru/uplcv?utm_term=how+to+draw+on+pdf+files+windows PDF link annotation
    • http://myarrahnu.com/mo_images/files/67786338188.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/mezosofowi.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/50953993668.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ajpbk88rbak33mvgfs90n3kmve/27346954833.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/tepagonojepowiderufosuxam.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/zonuvojubenexo.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/zalitedem.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f697a3d286---nuxuwitip.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/fudopudukepuzemolisimig.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/30179213611.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/91692623369.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/gafomolamuzojutivujuw.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/pozokiladesifebax.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/45416685539.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/46979858290.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/zowunowarijazikowigilexun.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454e79b280f---gukubenudaf.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/tuxogetidalumosovapepu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/16556472934.pdfIn PDF document text
    • http://cartopack.be/Images/file/tivakekago.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tenovopugedamowajepunilog.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/77420332061.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145fc1d538b6---dusesotizigadebo.pdfIn PDF document text
    • 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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 18004 bytes
SHA-256: c84cfabed3a605deb400399b151a2214d2a242772104512947cb3d80a4d508dd
font_01_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 10568 bytes
SHA-256: 5f951c0acb2e0a0a86172ab0b2df268f9dcc1a4e485921ca5dfc8ee5fbe6ebb7

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