Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6b3175361002e7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 18:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 73b6457ed9f25a9d1334d03845c0390f SHA-1: e01e740fcde6bd4d062b7c2af38af9b7ab0fc21c SHA-256: 6a6b3175361002e7e8ea2592b79f9740e9194d6111ce75ec826971747ded6db2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anpheatingandac.com/nbloom/fckuploads/file/8492730318.pdf In PDF document text
    • http://wadirumshootingstars.com/userfiles/file///66326819779.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180fb97fc02---68281679029.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/silejunufezipinazede.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/44011622342.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/regezuj.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/cffa7f4282a4b2761d312b355186cf60/4854420308.pdfIn PDF document text
    • http://apple888.vn/luutru/files/zutamirasugeberu.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/5853766988.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/43973632481.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/ca2291fb83a1d7dd037941c192c7a467/romufuvesirozotu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7c223589---mibotojigekux.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/sirolu.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/bonuzabovojibokopa.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227b33ca40---99729033215.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/94974808591.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/11597646901.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/36848601464.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c82c4ff4a---kexazevixomuvivarufarulup.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/fonexaw.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/19814094427.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/dividagimum.pdfIn PDF document text
    • http://regcureguide.com/files/files/dekivuzodopubufabowokud.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bf83a70e0c57f98d793dc44c2a1e290c/zefez.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/31311936133.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/4153296853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ssc+scholarship+result+2019+dhaka+board+pdf+downloadPDF 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_off0000b471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB471 11672 bytes
SHA-256: df5cbb3f321751f346f47bb4405a6451cf12e432cd7387868e45311e698ef17d
font_01_sfnt_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 17044 bytes
SHA-256: 34b60cd251c4778b86d89f1d21afe593f55886856b1f99a57c1be6df150149e3
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1