Malicious PDF — malware analysis report

Static analysis result for SHA-256 320576ac492b9374…

MALICIOUS

PDF

86.0 KB Created: 2021-08-03 13:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d9e60d04645b86b7b31bf07ac76ad05 SHA-1: f72fa5cfd98fec073c93e928bde58987d2dbf873 SHA-256: 320576ac492b9374bee53b664e01f2894e6e60e05f815ffdd7b7a0aca6f110ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=que+hacer+si+se+tiene+un+ataque+de+ansiedad
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/08cd952235ed06b1fb2a3995a2d9fcde/90929281190.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/n0j74klqdd24rslqv3019ccgr1/97023097054.pdf
    • https://liderpin.com/calisma2/files/uploads/revuk.pdf
    • http://ottotech.center/userfiles/file/1575981969.pdf
    • http://bong-dem-long.org/upload/editor/files/85491729535.pdf
    • http://abwalabamaave.com/uploads/files/xodopitisisix.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d082c1db16---19000290012.pdf
    • https://alianzatours.com/imagenes/file/63992051607.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/246f2bd33edef3b09fe2f90f02cb5d5a/jikidojewukifisusig.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/kiwulivofevan.pdf
    • https://groupburuemas1.com/contents//files/15762800022.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2dc60d585682aa0d20dc09a7f8a19b97/25926434985.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebad.bin
80587b4a616f21db2733f4de635cc695c1722a6e901d37cbbb06bcc772323046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 10604 bytes
font_01_sfnt_off000103c1.bin
876ce465e22b36b2c3af768dd636641c0787081bf038e3fec1309cef53e0ae05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 18068 bytes
font_02_sfnt_off000131b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B7 16792 bytes

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