Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2fd48a7a265ff7…

MALICIOUS

PDF

78.0 KB Created: 2021-08-30 14:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 807bfebbcfbccb23951f0e5f12c05169 SHA-1: 464e8c209e899507be4f1f459ce124e41e3bed52 SHA-256: 5d2fd48a7a265ff74281b18082758a2e34302b56ae1a83d779077a5bee9b5c53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains, likely to facilitate phishing or malware distribution. The presence of external URIs and a link farm on compromised CMS upload storage strongly suggests an intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=ca+inter+jan+2021+question+paper+with+solution+pdf PDF link annotation
    • http://zwickerfoto.hu/_user/file/17165839003.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6c7946b9c---54363616259.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8bd0201b1---46252866626.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hv6q9uapmobikugmu9dimpqak1/29566869281.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/xevisekif.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/30956920271.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m1h6c2qc7ii9cade9ejbuu1ldr/soperixixud.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46351bb5---musuziviworabesud.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90da0fc46---bozubedoxesek.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/l99o29kvh49siu2966gvo2igf1/39499723668.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/fc2b1ce9eb93e9951dfe9cb18e642d63/fudupofabefobomikaruvamev.pdfIn PDF document text
    • http://benetalent.com/upload/files/pedapakenaranezax.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/kusovavetaji.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/bfb9mds6oaivr4p0a3ejhjhgr1/depemu.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/7547867472.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/thllj5rh9h64keshtugaqns7o2/33819233189.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/24069576216.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/vakebijexojokixuvegefilo.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202108261243594130.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_off0000ca99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA99 17284 bytes
SHA-256: 41ffb0066d8784d4a52796620001373f3b9e01ba1605c1bc481bf227de004fde
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 11380 bytes
SHA-256: 48c36a501f26c02488678f755ce189e77228408023dc8e6a9f6e35863115bbee

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