Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2ddf25168f2290…

MALICIOUS

PDF

88.0 KB Created: 2021-07-14 02:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 506fd2d60e9a77287f1ec3a87b429625 SHA-1: ed405cd79b34e64daa8316f5d021efed88be9400 SHA-256: 2c2ddf25168f229071f79803eff73b81a5d907fe9a15f43a09bdeece102913e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://instant-image.net/UserFiles/Site/File/59159063118.pdf In PDF document text
    • http://azseal.net/uploads/userfiles/file/vexisuvepokopeba.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c31150a7c---misosijigana.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ece824cf7---dadizisufunipuxukujedakat.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/13151108457.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608327813c3f1---4759838362.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/25554959259.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160984e17aeaaf---vuvape.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/58695228395.pdfIn PDF document text
    • https://educhina.mn/editor/files/77139633754.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/xurexezabu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2050337b1---95990381433.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/vafisujibepinuwidi.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/74190181988.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e3aa3dc240089d832a5a162bb104ecbc/28835243583.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/rajogonuginuji.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/forosiwozudadutiwoz.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6q7o9osb2hdauagdiun108bmc3/6394891213.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/bepodigodedunid.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e1678dc1c031a590fc814484db4b11a8/nevom.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17535d925b---13783873119.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a2b194ca---ruvobeleluzegedosu.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/roketoxeberanokozurunu.pdfIn PDF document text
    • https://mmszke.hu/files/file/jaligijirovanitotoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+xp+bottles+in+minecraft+survivalPDF 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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 17176 bytes
SHA-256: 058122847bb41807b1df7f9832d3182b8bc04a369a8ec43be41cc65c172fb607
font_01_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 11308 bytes
SHA-256: f62d5dfff4d7762abe19fd415a0a96e40c2c0caa012005302babb5a357c06b1c
font_02_sfnt_off00013a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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