Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea2eb07fac88816…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 19:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21cf0acb11c01b43b7ba0311caa03c42 SHA-1: 4f0be53d3f4d25ce7a67a8386590d83d329ce7fe SHA-256: cea2eb07fac888165694a675e637f75f6453f7a80f80135fd09f8c5202e00eb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. These links likely lead to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=english+speaking+for+beginners+pdf PDF link annotation
    • https://2b3la571ga-70p.com/contents/files/42529037382.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dizijekugolumexamuxitamu.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/33737371263.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/53824367262.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/91956584968.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/tetugonavugenozolo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/agnlp3ru9klgdt4jksc0rskibg/10442472247.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/35664924181.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wuwifejamelobefafogovi.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/67383549836.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/suzigigu.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/96304025496.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/fixunugadax.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/86851557127.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/telamawipuwasozokomas.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b3b564181c231abe3c01f400a9cebf7b/36158356898.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/jibubepetiwe.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9b4752fe35cc4fbdf315a1bf0416567b/88133852351.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39c6f0a11---14465755436.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/muwigazolegufegezovoji.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/72477259961.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_off0000ae9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9F 10896 bytes
SHA-256: ff31fffb6db7c89da6b68ad213f7fce9df6e41f5927ac93305185e1f92951291
font_01_sfnt_off0000c73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73C 17016 bytes
SHA-256: aa205888079083e30e94b366e0b79f05fb71266dc928c4c8dac9ff000b2ef787
font_02_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1