Malicious PDF — malware analysis report

Static analysis result for SHA-256 a335284b054a944f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 21:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 04813234b775fed0f15ebad0502e33a4 SHA-1: 5087787698c239de414b115fefff0139888adde8 SHA-256: a335284b054a944f8e5feccce9ce7eb02c72415188cd65c0d8d550b92ad4d93f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The presence of multiple external links suggests an attempt to redirect the user to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://orsini-blasioli.it/userfiles/files/tikoloxoz.pdf In PDF document text
    • https://vpmemorial.net/images/file/99162162262.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/44294188225.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/57109944464.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kirujevadubuw.pdfIn PDF document text
    • http://krokodilok.hu/_user/file/pirilutile.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/nuvopelepijej.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049a6578ef---ruwegezi.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/dimugeweke.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/dumetefigiw.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/59699138698.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/57113456466.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/rikavitapaxulibebiso.pdfIn PDF document text
    • https://camelcarpet.org/d/files/30112202381.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/kudawodimedipasawi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/51226677551.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/xetonolemuribusinef.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/25454069108.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0437a46e6---19422643276.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/ruranuselixixudowusok.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090811553873499.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b306b7dd9beb8878ced329d3feb041b8/94159724069.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/xegix.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/webuwozej.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/waposafelete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jurassic+world+evolution+hacksPDF 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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 10800 bytes
SHA-256: 3e627afbdf1f12114be4a39d41c71d59d3d1f124fd077e0bf3c3b59d58f923bc
font_02_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 14792 bytes
SHA-256: b491cfeeda531f2c95c4620f15a8620ca6906bc4695eeb5bfeb1e3da9dee80b9

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