Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2f8bcbe690cf92…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 20:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1d69e0eafc7753c8d5c1c9cf70bcbe9b SHA-1: 5f04a5c0e2e81ddfe3dc12c91a2b97574bec1883 SHA-256: dc2f8bcbe690cf9217d9232437a1fb03b9298726e259aa40127be89fecbb26b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics strongly indicates the file's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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=pokemon+go+cheats+iphone PDF link annotation
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a4s7ojr3ikc13agkeh2cujfjuk/lozixilevo.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nokosidirenenilufupi.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/jesajikuvivib.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e717617a---tepuxo.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/totivutewititobemoz.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/kibavaziwurun.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/62426098630.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/98185558151.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/373227593099ed9f535e9d8623ec943d/wimomonawavajixi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161308f7a00346---wowam.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/45627713526.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/watol.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/didibepuputulipaxilurowe.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/suleju.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/jijukuvixojekukala.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133b07b5cd46---gatigulisurelutow.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/vevik.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631132442.pdfIn PDF document text
    • https://km2804.com/ckupload/files/80841744840.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109021312326581.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9j4v507pdqcsaclgc0oksup7oq/1112707166.pdfIn PDF document text
    • https://lapdonline.org/file/xikojorupeseletosabun.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_off0000c222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA34 18264 bytes
SHA-256: 8dc0c0e25e58801097e41069607afe0fa7e8bd2396af223f363c87ae51a1f764
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 10768 bytes
SHA-256: 39e85f2440a63b0145b223ee1425a0ca1454ebcd56a2b6045fe3ef48c43de2b8

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