Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa4c384f659e8a…

MALICIOUS

PDF

77.4 KB Created: 2021-08-29 02:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3c292f7a1ea729fb0399ea87707590df SHA-1: 6c86122269691bc2567f6e80e74ee27abe7598ad SHA-256: 83fa4c384f659e8abc33fea735e3905afb4cc4f4a56cb9699a64a1dfb22382cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggests this is not a legitimate document. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection, and the ML classifier and ClamAV detection confirm malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://cgl.lu/userfiles/files/wizalavot.pdf In PDF document text
    • http://cachnhietwin.com/luutru/files/63954362152.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/norunafavutitonavave.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2fcf1102f64a8eef449af4cc747f0a31/80376707408.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202108220856484156.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbfdfa6874---29889190881.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/fojuvavosudilebotililivol.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/zadesazoda.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3p06c27urbjcbfckeu50ff0g22/mevusekexobo.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/1837529562.pdfIn PDF document text
    • http://weingut-suppan.at/files/40607049618.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4571ce36c---ludaporegokomupej.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/90069262570.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a095ed690e9---gidizuvulasi.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/6500512087.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/72019101301.pdfIn PDF document text
    • https://senfina.top/uploads/files/98555217551.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6ec63723---35081891819.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510061107521639600.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8ab7d4c3---sujupanoraku.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/21940067065.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/41620421164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=polycom+soundpoint+ip+331+phone+manualPDF 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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 11120 bytes
SHA-256: 2b65b3b03ff243d655661f6578d3e63064d016c03664507141a8985877601512
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 17240 bytes
SHA-256: c15efc938fa130c07b3be9e1ed62421984d6241d3736b8fd67a50485807b7fad
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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