Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d54d7ef1d3f0211…

MALICIOUS

PDF

90.1 KB Created: 2021-06-26 02:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f3b38904014b89f3cb3fe25c5f22eb1 SHA-1: 07532c64de1a8976d21d0f85930f43c263f69b0a SHA-256: 9d54d7ef1d3f0211ab4ebe1b7a35df00a55a347a59a325b691e9e6f0fadb55c8
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://atthaya.com/file_media/file_image/file/zobewipapumut.pdf
    • http://altelaw.com/uploads/image/file/75133446730.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ef9358bc822d61845d2f7c6f48141591/dinipivejolebaze.pdf
    • http://abwmarlboropike.com/uploads/files/97745502720.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/dotafawomebesola.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/719a241fe88ce7297620774779240a4c/49467123945.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e08968ac---juxaluvozu.pdf
    • https://elitstroycraft.ru/source/file/77742354347.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f06211b16---zotigedebi.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g42g7hi9n2egni1s21ud4bvpcs/4519325319.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xolave.pdf
    • http://irinka.org/ckfinder/userfiles/files/85844438997.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9756863abc---26847541899.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4e297807250fd97f22e14b969f6b32b0/goxukibotojebok.pdf
    • https://sensorservice.org/userfiles/file/tebakinogogewifomabut.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b068f1e4695---95130059476.pdf
    • http://pwmtqatar.net/userfiles/file/67994268016.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609439a8a3991---11898690870.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d72099eb1d02e71bd1fbcb08a1756629/10942997984.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f0b0577dea7e3c9a0427625e34116161/bonozadotedo.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/43d44e5a0c9f52ad435352c35fa41796/ditaguwuxebogarabigosat.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bbf8c70b4cae4f382ef4e3ecdd23f385/zopuzu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clay+ceiling+tiles
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin
8b1b524dc410f7fa028640d0cd3b1142151149d478fb0503ae7ff47b25647007
pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 10328 bytes
font_01_sfnt_off0000ffc5.bin
77d828c20e45538031bd51c15e4c5c2f96fe56ab38e88ef0aee9da809a4ddd05
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 17500 bytes
font_02_sfnt_off00012d95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 16792 bytes
font_03_sfnt_off000145a6.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 16092 bytes