Malicious PDF — malware analysis report

Static analysis result for SHA-256 00786777525a4cef…

MALICIOUS

PDF

97.0 KB Created: 2021-09-06 23:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea311761976699e79ab7d8dec01ae48c SHA-1: 842340efae5609c3f34c645d649415ff4bcf623d SHA-256: 00786777525a4cef57d456b1706b60bfe7f8ab412d9303cd68629990c24f0fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware delivery mechanism. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=practical+tunnel+construction+hemphill+pdf PDF link annotation
    • https://readandenjoy.ae/userfiles/files/dadozuzefiginepazev.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31883553715.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9e199709---fozotisefuzotagipi.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/88496175935.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/91938625196.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3733049ec---ralelaxefavavisifewo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607712f45033c---fimolusuduxodomikefa.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/305648f8978719476b9799a62b1f04df/76526968600.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc60d0eec7---zozozovelojos.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ghsldh15dhkdt22vl23nl94gdc/voxominubovo.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/33189514083.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ja49slfq79i5ipq6emel9m3rc5/fanago.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/22170233937.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6646351331.pdfIn PDF document text
    • https://hiroyoung.com/data/files/vexuvafavepi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd0aa5c29---xegudukanilumu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0610e739---nalofejanodakowe.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/90092851713.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808978eb95---90398725840.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/zujapuruzigixatezenopu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/vubatimegasewalajexadop.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/70844512897.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/65291764303.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f936ab838681a866114f8a7909312f05/67911644554.pdfIn PDF document text
    • 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_off000112d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D4 10984 bytes
SHA-256: 6abe6a35a4a13f22a3a81f5e4590fa1a5d6cb372dbf551e279a9eb689af3eb3b
font_01_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 19156 bytes
SHA-256: 4786f7874468a4fbfb1c9daecea20aa0a5834a80d6ea194caa9195a06a446e6b
font_02_sfnt_off00015d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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