Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b14b8760844b91…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 02:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ef5498aba107051cde8e0e863047712 SHA-1: 8af6493757ef5096f0eebd25e44f88639deb5edb SHA-256: 21b14b8760844b9187deafecf19f029fbc2fd9b45b2722c90fc1b614043f925d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous external links. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document likely aims to trick users into clicking embedded links, which could lead to further malicious content or downloads. No scripts were extracted, but the overall structure and heuristics point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garglob.ru/uplcv?utm_term=how+to+draw+a+hoodie PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136efefcc9f9---gemose.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/46500609049.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zadesomijogixu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14473374085.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/mejositusajavinumi.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/sosukeresik.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/43671453690.pdfIn PDF document text
    • http://standardamulet.com/files/files/7835653578.pdfIn PDF document text
    • http://mextro.de/upload/files/ranemoxutunow.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/dazobikuso.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/toxuvufisak.pdfIn PDF document text
    • http://www.grifin.sk/files/romuvomamikebe.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/1905347963.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lqknajp1vn9bfucddmo1jgtso5/88377080640.pdfIn PDF document text
    • https://tsolisp.com/files/file/fuvafarenabuboji.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138427d95bb3---14947646151.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/zeponexugopewurunowaj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pusizedoberuniwa.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/nofurumamipadekafawot.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2454db3b6123f92d1310f159b4f5539b/dilovufuropifi.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mesozisaw.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/fulip.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/juvetajutivi.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/kinorexuloza.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/73594078900.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_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 18524 bytes
SHA-256: 452c8e5bd1c8249d9910293d498c2d25ccd81bc2580990832b44362de6515f8d
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 10104 bytes
SHA-256: 2c27a98ac1bf247a7d8e1fe1c193710ce5ff9c7facf0419f15a24b6604925f39

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