Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc991cba765f6ed3…

MALICIOUS

PDF

76.6 KB Created: 2021-08-23 15:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0dc495d0caf7177bc8f5e6e38bd61ad7 SHA-1: 9c58d3adeefd7b7f11c41897743c214fca6b5c23 SHA-256: dc991cba765f6ed35db0d0af21b983bc81561a68f441513b359d01ba2f099c16
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a7abfa23279f7059705137da853a45f3/44117078801.pdf In PDF document text
    • http://gajagotour.com/UserFiles/file/88737676154.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/27446211607.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/esajofosalobodaza.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/24961247883.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f5338ec75---narifu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/52155862599.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/61e23df97b02a149d4657da2d6bc4407/33695135255.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9709688fbd---pexamefukojokisevadefuwav.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/sexetunuduvaruribo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d32baf2934056f81f79d966f0195abb4/63473033024.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/4409510030.pdfIn PDF document text
    • https://blugarden.eu/file/wivifidarinepedin.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/34fa3a1c2127387cbe6490722db56901/35444098889.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/1041138174.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/86046212590.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/61676896164.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/34745376836.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5d211e800740ebb3e2168a8f815595ca/92001644259.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/97099942896.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/12952751663.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a9676e5f3---waxexuzikuruzip.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fatefegomozutafoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=transfer+of+property+act+1882+bare+actPDF 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_off0000c830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 16428 bytes
SHA-256: 38db579606ec3e05c484abb3d79c6139ca0a6d62b0dbab2280f839e10e69d160
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 10932 bytes
SHA-256: 1e92f147cbff41b9a62cc4b1de2dbb560395c8f924c535782c5dfa8f6cfdb4aa

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