Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bf81f639a455e7…

MALICIOUS

PDF

87.6 KB Created: 2021-07-22 20:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 90e65f193fb9df758f4d50aff597e779 SHA-1: 4c66ecdd0c755a92cbbd47d55c524a6a77a1609f SHA-256: 45bf81f639a455e7f83fb8df22a7dfc940bbe937d14fca290e47782535e648cf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users into downloading further malicious content or submitting sensitive information. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://prttour.ca/FileData/ckfinder/files/20210710_99B09F4036DE6797.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d942848477---11171959749.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/bazomozonajunarewariw.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/57873367170.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/11301703672.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tesosaxotujigajow.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8950r2rsbt5f1mn1a3uic37jbh/58570863922.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/61052637312.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/pagedexatur.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/67370574064.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/g4qb3qd3t8ocs6pmmcloe4cpe1/pidivaparojitewupuwi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/65e82711c973918ce1f738f0770b6a0d/14022771641.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mupaxapivogogof.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/10860138365.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb55637ca---43615887825.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/vezojaxox.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7f8s0k6qum0lhpc6kalhtnkjs4/rumufezukuvegikagono.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/a35i0n2ffuhatenib4okvpv7iphhr4lp/53794680574.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/wojosad.pdfIn PDF document text
    • http://praguetransfer.com/files/file/47281938363.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-16/20210616192322967886.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1bc36ac860ad7aab34f7a4bedc73a70b/22963301122.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607964e9d11d8---zafeforosufisox.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/93326838731.pdfIn PDF document text
    • https://naoshima-habitant.com/78351603221.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab97a0d52d---sanutexitudimogifudodopoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=principles+of+health+insurance+pdfPDF 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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 17292 bytes
SHA-256: 78cff164fd686e923fb998de8f0f500dab7b82dc285041241def84c6705b3be4
font_01_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 10820 bytes
SHA-256: 8a29fd9b9ff39e973f5c814a4141ee2f0f1034d9fcecec0c0fb2713a0ba1e593
font_02_sfnt_off00013882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1