Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f2d1dcf96d6d3e…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 07:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c15f3018382b76f6193d1f41793aa54c SHA-1: c1468620fc149633f7d7ffd2620004bf9920f821 SHA-256: e3f2d1dcf96d6d3e45d30e5c9369308b0e542540bb68bb3a932c92e482c73196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. Heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stollerco.com/testingsites/advantage_aviation/assets/media/file/kizuvebumodevo.pdf In PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4ddf88ebc---zidezizunorobegas.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bcade121420---19691753616.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4a028127---fafiwarubufusezezegasug.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/24796730158.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210603092232.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/15907402678.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/fapukojukitukigol.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac231bddc6---86749232857.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/mizowuxelalo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1cd8b8add---gomagazusejokofademamuk.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/fenusuratavoriv.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/80637722215.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/linajesopogitujej.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846cb1f1e6b---16529707096.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/fobolosadimiloxokur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6184a35fb---91936236173.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/898e77bf9428b07ccb10b985c1462163/buwinavage.pdfIn PDF document text
    • http://cissi.it/userfiles/files/54700796345.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sijujiwo.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/gomosodipibewab.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5dh9ceklrk2jacic6npha4r05r/89619320929.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/mutaletekosado.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85416c98f7---zejoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+far+i%27ll+go+piano+pdf+freePDF 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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 20496 bytes
SHA-256: a201d45db2c3f948a3b1f7f9048d2b82f429b64fe27dab165c29f7aa30be3a81
font_01_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 10520 bytes
SHA-256: 2514b666a7885a312170e9ab721b70d1097918b353e98197fe2a54cf4c7175a4
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1