Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb13457d0b0df79…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 21:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6157abb7d14a0234ce06131c84b87f18 SHA-1: a983b7c46bd013b29b4ea89457c69a3e70593cd4 SHA-256: afb13457d0b0df798aad64aa465e65992fb4d6d76e11b676ed1977a467f6829a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to appear as legitimate content, such as product listings, to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=ipad+pro+for+sale+in+pakistan PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d06917faa---dedikebenenoxitegumak.pdfIn PDF document text
    • https://yasacompany.com/upload/files/junewikaguxu.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/lenopunewajuzaso.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/12439988022.pdfIn PDF document text
    • https://citytrafik.nu/images/file/lolalitumigefixubovola.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/devududemirupuvaduxo.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/pepajojefuduv.pdfIn PDF document text
    • http://dytac.hk/userfiles/40431117356.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/teserar.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/19473109739.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-16/20210916011024902785.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/33242850227.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/nujexudosumutejikeb.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/40886168151.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/d4bcb1d3345a0f803a34b24738d36b1e/sumujogo.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/fadamoripowu.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/39756827785.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/kebawilijajure.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/mepebugatuxofej.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/59975563364.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/gumiwu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac22c2d60---48335656044.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e4106b2fbb8759b24e437c8a8445d6f/jutoletopisutibanasudijas.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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 22768 bytes
SHA-256: 08e6a547fec0c7b873461b42eab632fb065a2c6daab604693bd318a480d35ca6
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10536 bytes
SHA-256: 9f58f18d2bb15336e7419c8d84fe2725e022618a09d1d797f37809b2e26f8071
font_02_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1