Malicious PDF — malware analysis report

Static analysis result for SHA-256 afed8ea525ff5292…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 09:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e340e3cdbf652e09275a12e38cfc507c SHA-1: c12e82279ba82804150927420f1fbd121ab39331 SHA-256: afed8ea525ff5292224e309db48acc2d9bb512774c06a39a72547eae18f76d33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, while some are marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://eetravel.net/file/bijapodifamizo.pdf In PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/80634551439.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02829d1b3---7282349577.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/bubanaronuzuzesoped.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/luxosetosekajudome.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6275d9591---58203560829.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/loragadisalefi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/89593331256.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/52105265556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d1ae8235f---debuju.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/folufijorumamivi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/midipojoduzotamukakugi.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/99541858347.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/94183508429.pdfIn PDF document text
    • https://rotitelor.com/contents/files/mawoxu.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamozubigidimararupuwaj.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/fisikigagula.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/99631708274.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/nezatejuvufe.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vixevunopovoxa.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/94137507898.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/lilafajodevamuf.pdfIn PDF document text
    • https://aneri12.eu/res/file/82843900329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=can+you+airplay+with+androidPDF 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_off0000b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB212 16920 bytes
SHA-256: 6416938d7ea5483b87bf45fcfa4834b331a15c30f70cccc7064304aaa0a592af
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10520 bytes
SHA-256: 2a3997abbb7afa3039e96d644c3526c2b650d30196972c74babc4568a14baaa6
font_02_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1