Malicious PDF — malware analysis report

Static analysis result for SHA-256 7359ba6027210a96…

MALICIOUS

PDF

87.7 KB Created: 2021-08-16 15:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a9683e75ef0c8fef50756fdedbca834 SHA-1: aafac5f6939a9c20151939eeda994cfaed11271c SHA-256: 7359ba6027210a965576e4693b9b0d80bcdddb2f2fe3fb6c380fa8b8d97f9da5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The presence of numerous links and the use of disposable hosting suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/217f359f94a060886af15482da7aa86d/werikijowinowijufe.pdf In PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/49111179438.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lomuwuzagejoselusolemu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c57e8da63---bavoredomozudom.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/9gdds14hkvi2fho004a8bhdal7/veketudumemi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f5f63e6fd4dee39fa8cb61fc70cf11fb/99367416196.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4345cd96cab56061efa9d7fcde554c0b/nefepafinifojejesawi.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/fesito.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/20975996894.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/68255685831.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/xupuzebodafagadepoken.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/gitukugiminogemulidafe.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee699ca72a5---peradexi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161082295e78de---20434288914.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dd0ad686---narere.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/kajilo.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunokobinabepaxopudebomij.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcf97b44d---newowivepexurajegoxa.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/pewozetozadaxir.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/0b65b1db971718fd397bb4c31df0cca4/bururekiwofik.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lrscpc682ejc41t2o0pee2pb56/zidukiparogixa.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/mugexefebuwerevej.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c954a14a9f5---jejukujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+fill+income+tax+declaration+form+2020-21+malaysiaPDF 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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 17288 bytes
SHA-256: 54963c3ba102782bc2b6dff9fa42e2bbc2040fdfb89e1e229bcce6175dbcb57b
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 11256 bytes
SHA-256: 665ee7d1c843f22fca3c7c70612666d7644910dae1ebecb816d764bc22aeb106

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