Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c30016467efbbc…

MALICIOUS

PDF

90.4 KB Created: 2021-09-08 03:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65494eb49edf67c692e7b19b89f73e71 SHA-1: f0e875431512584ef79e3ddfdadd844c0146543f SHA-256: c0c30016467efbbca1cee57e570e45176d83388be9e43d00100591917d2c912e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to malicious or compromised sites. The embedded JavaScript likely facilitates the execution of further malicious actions or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://partnyor.az/userfiles/file/78016093643.pdf In PDF document text
    • http://taiwan-casters.com/userfiles/file/bigelojomukapara.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/34579537292.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/xuzavavagabali.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c8sdg0o32aadu5cd0tls6l5rv3/30376789713.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/abbe186433705b628ca84c7aab3cc4ed/xoxofugo.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/negikimima.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/47241638531.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/31625714429.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/57668755471.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095efd388712---62575256940.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/52940434746.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/18287818126.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/28660824873.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f0c6af298---2318838750.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/35275413106.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075959741f5b---37665451286.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/zotenodafagapo.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/94d36bbe4d726a5b3e1b7b0b45fd2f6a/29133116541.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/90443844405.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/25903351220.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6dd650acfd3683bd939f816b8814908b/9328682900.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/talojisiduzubifep.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f42e00dc3---642982329.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8507e8928c---zotevekadevaja.pdfIn PDF document text
    • http://mayamalay.com/clients/874202/File/mupopajeduwisekirimase.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/875be15c96de4e22fda2e8f1beebe82d/toregemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=assemblage+bois+menuiserie+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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 20852 bytes
SHA-256: 3c421a9ed67f1b42a9cc769d1146df08e4932d330c114b2815a6b3dcba668d3c
font_02_sfnt_off000142c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C6 10964 bytes
SHA-256: 134bf9fee8dfc507ec23be54c4d7db176bf887229ae4640553df96df12a6bf7b

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