Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4d770f2b46abc1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-08 13:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 534bd06a52712f33cb86fd3cfab0d938 SHA-1: 6a356e9b2d67ff6028dfbf2e2e8d7afd06ac9b21 SHA-256: 5e4d770f2b46abc17b9561a080f6eeae47f6167cc109e6ec9de325991d541b77
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users to malicious content. The PDF's structure and the presence of multiple external URIs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://albertoangel.sinecsas.com/ckfinder/userfiles/files/27673407378.pdf In PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/97943807761.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/54677136667.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3d7f5040a2eb765fa68f48b20fe164ad/valifakavulafa.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/gaxenimozumuvebaxasasavov.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/36721971720.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/43044682271.pdfIn PDF document text
    • http://anindecor.pl/files/file/fimaxutawamaretukojojowu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/lirabisupugabomotuxekili.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/17883198016.pdfIn PDF document text
    • https://dptech.vn/uploads/files/36522061942.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/38650582855.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/36266337866.pdfIn PDF document text
    • http://indexone.ru/upload/file/52142406797.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4fbd55716---norenitolikegox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161307f2ec15b7---97447521283.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/felarumedunek.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/kigirexa.pdfIn PDF document text
    • http://skia22.ru/pic/file/35609333380.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/23485647267.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/fajilerovewofaditebu.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fasitovi.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/46945254380.pdfIn PDF document text
    • http://bluebossa.pl/files/file/fezosizedexunete.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/waxadenivazamatorefuwoxob.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/5069094784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=caroli+syndrome+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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 18048 bytes
SHA-256: 7edfd5462accfc86f2b620936a9ba26261e8808a03e669aa6e0b638d8a726abe
font_01_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 10708 bytes
SHA-256: 067121d9c04db2022ccf4e65aefa53721adba99bc7b1fff4026b203d8ad47d9c