Malicious PDF — malware analysis report

Static analysis result for SHA-256 12993e5a891b4409…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 09:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 869e194839d4cf880b87c39080a9e34e SHA-1: 103073631e8e1a856fe51a7ab91ae96dbd11d94d SHA-256: 12993e5a891b440942f65b42c98f8ace21c25f07b57bde7c66364d4379708d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or malicious websites. The presence of multiple links on disposable hosting and compromised CMS upload storage further indicates a malicious intent to distribute harmful content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/22147770420.pdf In PDF document text
    • http://retrofotr.cz/files/file/10808300981.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/waguko.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89cd6e09e3---guzeb.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/63560811963.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/63664760671.pdfIn PDF document text
    • http://vgkbuilders.com/assets/files/ximatop.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/31086214625.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/60440513106.pdfIn PDF document text
    • https://dm288.com/slicice/file/77661346889.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/lenifijap.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/dd09b7f98a1b8e68f7a18c99cd7b6087/jadejozajikite.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/40fa21a40c2dc818a51cffe2cff8deaf/xubogekodepor.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/nisodebuku.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/12956838824.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/74cc8625be6dc841283265a0b49d89e8/30682472393.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/87743432626.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a6382bbc5---lawexiturumopup.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/a63890f9165583a4385fcef88e381b0f/82807783715.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/60391865628.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/19160509120.pdfIn PDF document text
    • https://inncredel.com/uploads/tulozadexaguno.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e195a3cb2b6---90895802475.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a38a4baa---zarubuled.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/51f711c89046d8544578c813222df678/7185754355.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81c613f23---tigavirejaxamaru.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kukaderuretanexizododila.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/puravajusagujukukifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=14.2+probability+and+sample+space+worksheet+answersPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 18568 bytes
SHA-256: 2cdcc66bbb8b8701ed9c9cbee3a2923196621e85bf666dace583f2e0439a9d6a
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 11432 bytes
SHA-256: 9182a524d9618828dfa2d6a5746805da86ece604e37543e2ca9cf73cf0231b96
font_02_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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