Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae64e684895d1446…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 12:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8f09c477268000a004e0b980caeb01cc SHA-1: 85e6b7ad2151b0872d32d6c7b6a39d5c9de07792 SHA-256: ae64e684895d14462c07ff387201a7d56de764ee7aa73d8edf889a6ea420f865
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, but the link farm structure is sufficient evidence of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3s0gtk92lvhnanekvgjl98spbd/mezaj.pdf In PDF document text
    • http://animalscipublisher.com/files/upfiles/file/saxokosoku.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831020d421---84456984407.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0715b21d98---98239461331.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/sulotolizejalodoz.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57ac06b66b---9674845680.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/85apikuflihp2ohrguscnqj28d/72000312287.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/27638332519.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/jusobaxituvogujezi.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095edd8bbc9b---29336615907.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v7l5n22hictf4tslieej1dm1tf/ropugegu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xutelofezilugiwusifowevo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/90889281867.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f527e4f3b---mirola.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/13119568940.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/4865aa6da8a7a646f4d5bea1396e0b30/kobem.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc33a67be0---80269401472.pdfIn PDF document text
    • http://polletnv.be/uploads/files/girofetupuvufuzupag.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/fefefutipadusugitubep.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe0a43df7---90119134851.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/84334100901.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/50615f28c575801f6a9687df9d5c6280/21355464096.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c2c9b1b7c158821d91ead73a7904dded/45347311491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=complaint+letter+to+the+editorPDF 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_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 17688 bytes
SHA-256: a10fbd53f37ff34c2c0284852191c1ccc64d2b3f3dcac255f161d24e46c30895
font_01_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 10520 bytes
SHA-256: 3b872b23cced6fa649edb025281b651bf1100b87ecd7c65a85d840b035c309b8

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