Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7f8ea8cb0dd506…

MALICIOUS

PDF

83.9 KB Created: 2021-09-10 18:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26e89235a818a10ef458f2f84b1cad9a SHA-1: fe9603e4070aa6930a79d1fd80dc212aa0e8e34b SHA-256: fa7f8ea8cb0dd5066009a49ecf14347b43960b7306993bce14d81a2d4136afd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://coretry.ru/uplcv?utm_term=how+to+stream+a+movie+from+your+phone+to+your+tv PDF link annotation
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zevonugeditoxu.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/pidug.pdfIn PDF document text
    • http://sjanzee.nl/file/lorizupisek.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/7467016533.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f8db296e586bded0f156abccc46c30f5/basukunevenojebevixogeve.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/39740920999.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/24979911403.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613912a389c64---jovej.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/11815430063.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/zufuvinusanufexez.pdfIn PDF document text
    • http://gestioniarmatoriali.it/63590489427.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/korobef.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/dirifu.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/84820851925.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tevutozu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/36e0e1fec8d3e0db743ee1af8ecb0a8e/juridiluvinigawozorumu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/o7d4qkapqkdrm8963lejtrua37/94116480934.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nusimirirawapokaxeni.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/lemer.pdfIn PDF document text
    • http://zeci.nl/im/image/55016331699.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/pufesirutew.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/22413607337.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/gelotivet.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/vofetejubobonejip.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/76602091365.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/93830066771.pdfIn PDF document text
    • 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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 16912 bytes
SHA-256: a88aea9890e733e516bae8923e19ce81305cded00f16b3d4288f488499e6bdec
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 10932 bytes
SHA-256: 528db6acddad9a489b23c225c21aba527957499e5a907ce6a8ae0ffb113f572e
font_02_sfnt_off0001290b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1