Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cebea255610cfc7…

MALICIOUS

PDF

74.2 KB Created: 2021-08-03 16:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8fd94142274e50d8542ea858c6e8b3e1 SHA-1: a9ff75c47e60031a3f41b9f492475e69714da585 SHA-256: 9cebea255610cfc7a7b0346640dbd00d822c957298fe9906fbf0570c5e42edfc
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, many of which appear to be WordPress installations hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=%F0%9F%91%B8%F0%9F%92%84princess+makeup+salon+princess+dress+up+games+-+princess+fashion+salon PDF link annotation
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/59d583d076d5c8b05ea69557ead7c484/97590271713.pdfIn PDF document text
    • http://nensi.si/upload/file/90734332059.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aaa3c8197---pasakujozes.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/roletenasad.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/43cebf7788b87f9246097b91e6761c7c/dapolajagusuriviperesiv.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/41292652759.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0283a75ec---80956401652.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sfqsqf7daktm66nem8lr05p9u4/16843735617.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077640377576---buvukojogimeponifominiri.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/lufolokemavujaru.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/84332109415.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/felitimutafu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b80aec1b---nakefagixozilejovijum.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c279db15091---pupiwuf.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776724f14c---53734936621.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c667c13b0be---jamapajubadul.pdfIn PDF document text
    • http://www.asslar.de/downloads/sijopawe.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/57v1ndmtjgnggo1gnduj7i0kn1/43315431306.pdfIn PDF document text
    • https://anjingliar.com/contents//files/telepukawevoliri.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087514023f85---60090027657.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/xuvaluwafiwomapat.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/44558410350.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/moxozibobudokevinomovig.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/sokibopulumex.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_off0000bc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 11100 bytes
SHA-256: a7a01733e5cfbf755dd205cf9c8ea26a58004ed8e34fbd18e9da5f50a90305bf
font_01_sfnt_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 15964 bytes
SHA-256: 270ef812d57419fe3b39040e34c0d99e26736d8c0ba717f6be64c5e67b90d3e5
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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