Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddbb79cf50d5e22…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 10:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c39e69a4b0f9299209d296c41249c3ec SHA-1: 93db758e3b79473609f1aadb5b4e3d46f08dc7da SHA-256: 1ddbb79cf50d5e22f91f79bd3544068f9efc447df2c159d9c0376e84b3102c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=made+easy+chemical+engineering+notes PDF link annotation
    • http://elateridae.com/images/FCKeditor/file/fipera.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/90766590617.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/15089358967.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/47933746140.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48690bf662---gofetu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a844284e0---83675177827.pdfIn PDF document text
    • http://yuha.be/_files/file/15871432815.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/felaza.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/unuukrofson09jcmc15jbiunk4/95764210005.pdfIn PDF document text
    • http://envigest.cz/upload/file/94092786116.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a29ff087e6ebd5baef236b5282b309ad/55999835571.pdfIn PDF document text
    • http://www.asslar.de/downloads/rojotorevonekuviv.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3779f51a3bea742899f4a855f3376f9f/pewonaw.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/kikekaz.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/jadevuxe.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e1e350c8c---zujabubeninorekoda.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/28327352189.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/12660734515.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6aac72d049a162c6cb37ff481bd053a4/lefepakogevekirotebupit.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b90964a77---lenijexebawasadumeg.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee10bc91f---bimala.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b18bc5956---nafaxoto.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077812dcadb6---49820202876.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609639712d218---jomunejamolumaxumul.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/lexugesodusexoto.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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10924 bytes
SHA-256: ed3cb527f033064ee76f234571f38c147a15af39b2b78b493df20da5ff9ea58f
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 19144 bytes
SHA-256: 9b7e15f980a560e527661615337da77a3b31e4d3fdd3c9f5306cd69ced00d0dd

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