Malicious PDF — malware analysis report

Static analysis result for SHA-256 864577c722514dc8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-24 07:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 003427d746e93bdd4d4161489728ab35 SHA-1: 61769e4a77e3c500a7a710378c4adda3bd6a72b8 SHA-256: 864577c722514dc8653f1dcb645ac1bde91fe7f12bc38d5da781ca9c3463ce1e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://taiwanquinoafamily.com/shopadmin/upload/files/vupamajar.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486c4975fbd---17613343015.pdf
    • http://retailcop.ca/files/fufebemafofuvekazole.pdf
    • https://musikkursus.dk/userfiles/file/66726647101.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/24097787073.pdf
    • http://apluskleaning.com/admin/images/file/58766272532.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161496d6748b63---sasoponuxofekanu.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/wavokuxatiduvixu.pdf
    • http://dges.in/userfiles/file/zinotudigo.pdf
    • http://vnndt.com/Images_upload/files/kolakitolirinufur.pdf
    • https://abicecream.ru/ckfinder/userfiles/files/dulefosojiwegikilubizod.pdf
    • http://yanartextil.com/firma/files/24057292737.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/jaludotagik.pdf
    • http://alburigiott.it/userfiles/files/18925040968.pdf
    • http://gsprojekt.eu/userfiles/files/88249159792.pdf
    • https://makojudo.pl/zdjecia/fck/file/92630413010.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/46985953410.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/66943826641.pdf
    • http://falconartistmanagement.com/ckfinder/userfiles/files/9634583392.pdf
    • http://cosmikkino.ru/sadm_files/8913049753.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/fuxitonofazoteluruxutalen.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16132154882fce---19424330049.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/96276226410.pdf
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/11497655562.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=happy+birthday+song+in+malayalam+mp3+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 16792 bytes
font_01_sfnt_off0000dfd7.bin
e2fe9305d55aed7fd26d338b06a25294a500e16b01ca93294cd884ac28a17ded
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 16736 bytes
font_02_sfnt_off00010b31.bin
0fb9cf50e12d6e8b8fb8669f3bac8804ba1ddf00e3d9baff7bacaece9e1a9e33
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B31 11212 bytes