Malicious PDF — malware analysis report

Static analysis result for SHA-256 f773a078046e5abe…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 15:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9aafb70fcf57dc6c3093a99c000ffb69 SHA-1: e8b8c4d062df285dd2c26c84f08f640179f043e9 SHA-256: f773a078046e5abe160bd0b4e90f1f656d0c2318f8b4fb8098f678079c1870d4
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://topaslt.com/userfiles/file/89610962910.pdf In PDF document text
    • http://matchedtubes.de/userfiles/file/1523962125.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbe4101891---xukexaveka.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/togulagalatoraxafiwo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/xorufodibile.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/aa5lerod0en6fneh5rtn52vbt1/12837266435.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/molozinoxefamemozi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0362bdd78f---22999063234.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/77984730079.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/49495716040.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2b3a360e8---jozogaj.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/17562411106.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/62991614669.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/24054715522.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc13992ff7---25173536375.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bb3d7611fd8c6b44096d20e7c7d36093/fonofaxorode.pdfIn PDF document text
    • http://polkovnik.su/upload/file/govuwor.pdfIn PDF document text
    • https://thepainter.asia/upload/files/49891678176.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/dca7666007ef5003aa21bcfff7469c71/78357920401.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/eb6c31c67a7a544232319937b3268c76/lanozarijaso.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/vowelipefosikomulasuza.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79320706121.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/donedufusipaketugogof.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/lavukesebesijaka.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b090f6dc197---fusimigujotufozexifirila.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076695f70ece---tipapaseniwaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mcqs+on+dental+anatomy+histology+and+embryology+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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 17848 bytes
SHA-256: 2b934834fd692c8c16387f86f28f7d8df0f23fe237123719b1fc4b7392b12eff
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 11460 bytes
SHA-256: b3d08c7c77eaab6250d65e1b6646ba59f5e17be77b67c1392c39c345730959ae