Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82af540337c0f09…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 03:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 814cb1b590b6beebf2df0485bec3753f SHA-1: 6c344b2cac8a8c312f9742c7229efa5997ba559e SHA-256: d82af540337c0f092c91a2e382421b6f5893cbd8b0ab10aab101525265411eab
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gyobel.it/public/file/8822292838.pdf In PDF document text
    • http://baraanduliaptti.org/userfiles/file/8279694760.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1bb93507489920dec7029a85d868b474/rulogos.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/sixanazujebefusoxabogop.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074028276b00---binurenoketugujisaxakov.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/6781424463.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/42913879097.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fec6f1d5---sekamumalelirobugederowif.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5042a4b42fad8accf74f9aa8904d1acb/53652296099.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a89e0609ecab91e322b715c223bf5a2/53082161920.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/15965859350.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/95563818307.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/nixajux.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/dinidulugegavinax.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/81694245061.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/85315554433.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c35623b3---10205885112.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xumuvilutuluzu.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/35484757529.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/48762440251.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749318da87c---61534886692.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/59980323248.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/kakovepakokaxasenopomot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=phrases+and+clauses+exercise+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_off0000c087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC087 16304 bytes
SHA-256: 064cdb7b6d07ca3a210300ce7712d112c3f33337216b28e1e69ba05b7686b106
font_01_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 10700 bytes
SHA-256: 6bc517aa13d5e8ecb2b694102579a045814b6af8b10968999a99dc3b6f31ad2e
font_02_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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