Malicious PDF — malware analysis report

Static analysis result for SHA-256 043bcdf3c7a30dda…

MALICIOUS

PDF

97.0 KB Created: 2021-07-31 12:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0c8043724194643830494386cf6f3ffe SHA-1: c49b1a11df4e70d6c8d8101423e4c4b63c0a97bf SHA-256: 043bcdf3c7a30dda06fbb02cb1f0dfe1ce13a19010a5c2be7fb0b2ea0757ed35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://wastran.ru/uplcv?utm_term=exercices+synonymes+antonymes+cm2+en+ligne PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5abdf3d179---54773611074.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/nukitazefu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/640934bbe22b56cc33439c0cfaff2b0c/90604474703.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/82044940926.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ee5451d13---podemavizozifafudojijimu.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/zovuwarusepuwixisazug.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/233778125bf317a2dd0a87be7b1d1471/6706726588.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/2684147948.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ba9t7aesshfbgrnfiia7i1nr56/wosanimuliduwer.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/65601586820.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e71221d3---5114891993.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/59019594430.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/13744950926.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/woliroxozufa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9362935500---59345715433.pdfIn PDF document text
    • http://changdahk.com/upload/jofowezapelotut.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8416f0a10---taxilazidomiti.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/96479731998.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/04acb5fbc1205ad0a3e3bf4913c1d631/98312316226.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fekuzaziromodazejazapirak.pdfIn PDF document text
    • http://medi-sen.com/files/files/51548190199.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/ririjitidi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160908d7aec1be---faxazinebuse.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_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 10892 bytes
SHA-256: 6aa30318584489194dec53f71b8efc692938cc4528af20e2cf1bf6363584ec01
font_02_sfnt_off00013e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E37 21468 bytes
SHA-256: 0ec6a91f6d29b0a6fade881d412dd7f0f0154089edfd26ba695aa84e04ea6f7c

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