Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bbf9f534a4d779…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 12:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34d2ce809cc8a1c958068f4b20224cc1 SHA-1: 658d9fcc85bf7f77e058a6ec4d9da4fd8ccb0116 SHA-256: f0bbf9f534a4d7796c46ae30b6f0ce2ee4a8a794896213fe0e79f43a8ae3f3ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous URLs pointing to external PDF files hosted on various domains, some of which appear to be compromised or disposable. This suggests the document's primary purpose is to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://enjoybowlramenandpoke.com/uploads/files/povizi.pdf In PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/68956685668.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/5332697750.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/47393238351.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ff362b11---jovowomuzibapiropogolu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/21142147954.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/paxukesefop.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67192da36d---jeluvazagufudusi.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/49870257236.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094a35669d72---bokanel.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/17390495585.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rixadele.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9767aec17---ximasi.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/goduzegivibexat.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7288d46c7e---99876943081.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/zojarudidu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf589140e07---fokibokafaditakovelov.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089a844b6417---fevejusorutiravu.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108021055573095.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/26801775048.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/62d285b25ec650ab1dc419f0b9fca2ce/45888785465.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e5a196c62ea930169d876a29de9ec7de/poxuxawunusipof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=smarter+faster+better+pdf+espa%C3%B1olPDF 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_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10884 bytes
SHA-256: 7a324c844c9030d940843bfe016b902d94295bc29df5f9dd52f5156425bf3db0
font_02_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 19180 bytes
SHA-256: 9801efb375bf78650971ee7fd5161282bc90869484d492f0d19598187eac545e

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