Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a84850de3e375aa…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5772115260382dfc00aa41a82cc204dd SHA-1: f8d4b42c2ab0f3c1e5d0c62fc0e961046ae11e01 SHA-256: 3a84850de3e375aaf5277ab18b006911b80a28d901171d3506579551eb8e440e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The document contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites or manipulate search engine results. No scripts were extracted from this sample, but the presence of external links and the nature of the heuristics strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pistant.ru/uplcv?utm_term=barron%27s+ap+calculus+14th+edition+pdf+free+download PDF link annotation
    • http://think6.net/ckfinder/userfiles/files/20210630013157.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/5944112105.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/91681060617.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95998642629.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/76989986377.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/nq2ivcthprk756d0ngd18v0p33/15390852816.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b92152e66---4165159424.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b1191c43---vedofudunoxotorawa.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8lmjvhdp5hboar28re47i2lps5/rozepupexaroxixatapi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609804d4db63a---berutajamilijatidij.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/gigurusavuv.pdfIn PDF document text
    • http://industrialdevices.in/uploads/99791982322.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/vuxazemeraxuwisopulal.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/weninudosaxeferajugi.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/38807985391.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/cb51ef871c418d4aa23c603bfd5e87a5/torunisixurisurab.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f8c7ad83---bodegolesuwudavosuka.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c24a422e470e43b4c07aff9ee23eb1d7/99090997722.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tumetekebo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4b9382e6fb61ab43f9702539096b5186/49302512290.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/35287293913.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b152155dbb5---sonilofozujupufadozi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9faf0a39fd---2350199785.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 11120 bytes
SHA-256: 660fc4cc15e28ebd2a8f8b570f230a69f35b6311b99e506127c5eb2e10816699
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 17360 bytes
SHA-256: 2ea294d9412620db8f7a1e0cc5d181253669537dbd4336a7500cf1636a403a90
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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