Malicious PDF — malware analysis report

Static analysis result for SHA-256 749e830af48242ba…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 05:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0670995bd840815b577b0d5a830b6870 SHA-1: df18eea7470ac8ead47e602368ba623e5c09894a SHA-256: 749e830af48242badff6b2bc72619b7db25083d4eb1c4fd8ea70cc7301ad905e
176 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. Numerous embedded URIs point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://smidgel.ru/uplcv?utm_term=adding+and+subtracting+decimals+horizontal+worksheets+pdf PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8030dddc681fa598bb0b172dfa1e93a8/poxoruketamujikuboja.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/duhn5t9r4m53sokep720pm5agj/35939821813.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e214625c7---92128242786.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080416445594.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/tezudidoxog.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/nikimuje.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f54dee0e1---13433202600.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/66qkfqf6grvc7c1ue3ibadf7er/88992392483.pdfIn PDF document text
    • http://slsnn.ru/content/file/kivowinomewemomuxi.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/sukog.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607581ffa44a2---zitemi.pdfIn PDF document text
    • http://wamer.org/userfiles/file/zaxomawuzab.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160759b8c26ddc---98207252437.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080de6197986---fijal.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/92736302719.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/botepijazubiz.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/mawavenaduzer.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nolijuviwo.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/89896606055.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/79931733765.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae0a8743---wonenejimaterejeder.pdfPDF 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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 11528 bytes
SHA-256: 29cc12a3485fd251c0d29b9c04bde9d1b5e960e17679ebda2a303e80e847b5f5
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 17132 bytes
SHA-256: fe263b8761ce5d4af4471d18011bb86152b48cbd6cd8dc762aef9596dc9e5a25
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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