Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebd0a7a10b66293…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 10:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 055212f8b6c020382e010f4950a496d5 SHA-1: 8413e7457b0714caf8a8cce6db4810f0db87710e SHA-256: 9ebd0a7a10b66293d20423e27c4acb60f7d9c513218b6fa6e38bec070b120fc7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malware, aligning with a phishing and potential malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://graczeonline.pl/userfiles/file/86103316191.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3b2931d99c9ffee64c16d6439586b9c/61181166973.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb24bc1601---seretasopa.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/54804984618.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k1l946i37hp9fkjnu0fdb7i0um/64843852572.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/ladotomobigisunugogibogo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/maxipidosavewudemigaduwif.pdfIn PDF document text
    • https://cooperspick.com/files/sixedotikixofuzoberipuli.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/72593628523.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/16378140940.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/ronorixiwedu.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dilopatalakapafujipe.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/14719457828.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fulojuziwerudaba.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/86749454062.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/10259504146.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7125858e---poxopimawevozij.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/tiwuxivewuga.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/41vqa6n08lq6vltj7kjoego1ie/zupozemisekuz.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/poxar.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/betozigijowok.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/93781325656.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/77495246211.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/9795647125.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/semimo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613331fdc73b0---dapatodukivu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/vewatovelawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+how+to+recover+deleted+contactsPDF 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_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 17688 bytes
SHA-256: 62b7c3aefaa03a6b1af438837091bc04821595a855089c77c82abaa9b03996f2
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 10600 bytes
SHA-256: 3a36c549d8cb4f85b1bd0ebab0957e1b135c0e9b636701a9bfb74b8ebd5e1ad8