Malicious PDF — malware analysis report

Static analysis result for SHA-256 014d163a56aa59cc…

MALICIOUS

PDF

76.2 KB Created: 2021-09-26 02:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3981b2adce1e8894bb8b0908c2a72e8d SHA-1: d354d218db6b18d3bc5c60023720d377959952e0 SHA-256: 014d163a56aa59cc531986ac29eb444aa22065c5ca8833e7c8554d1b344c8e68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://emilygrilltogo.com/uploads/files/17960060616.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9e5b632fd---80214106868.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210917034440.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/90208129596.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/85787813885.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/73040859308.pdfIn PDF document text
    • https://ever-progress.com/upload/files/lepuvawumiwe.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/90493982253.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/86668336559.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/13211828618.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614740b43eb55---kekedebidesizuxuzikolu.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/40204113815.pdfIn PDF document text
    • http://119pump.net/d/files/4690600171.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b6ed8ef0---84898678415.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/dimexekokawopuzodurur.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8a5a7bd7---xalitorogoxegoguxude.pdfIn PDF document text
    • http://vuason.vn/upload/files/waxerisizijoguxuko.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/tivuxated.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/direvidoxupiwakojefeg.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mp1k5n0dhveovp96q1d8beq06g/91652884886.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/51814598836.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/35816731285.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/62574429218.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/tuxasoravez.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/14510406363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sports+heads+basketball+championshipPDF 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_off0000bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD8 11084 bytes
SHA-256: 26dd2463afb010cf842ad013f6378fe8a872e4e7c1a635aa3369484ad7311da5
font_01_sfnt_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 19572 bytes
SHA-256: b3a1a921d2a3a288cce5f44eea947ebf85b5bf3ea6a81957fcc97dc55aebb7ee
font_02_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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