Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62cb795c4678760…

MALICIOUS

PDF

74.3 KB Created: 2021-09-23 00:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b143d61e6f83012a4f4b76ac239c955 SHA-1: 0c9d21c7b461161558c001134d4da8af98bacfc7 SHA-256: d62cb795c46787600d5b1102308f9ac44b9890ed7403ab55ce06f4a6d63efa39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute additional payloads. The numerous external URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=download+hidden+call+recorder+0.72+apk PDF link annotation
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0bf72c362be353d3d3d9fe45218fbfc3/48350987218.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/93036360237.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/xonilixelilaxa.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/7935898578.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/sedegobejov.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ben8s8bb3nse5obt2gpojj0920/rofibolik.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/51666306562.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/7341763324.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/83632678700.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kipinalobimoxojuzajuma.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sidumudizofesetududiguze.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lekubi.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99e92514f---76279833821.pdfIn PDF document text
    • https://wasael.com/userfiles/file/kezepegitugofude.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/kuvaxuwomobosututokawo.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/68144526938.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/36541021993.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/25807823624.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161420844252f3---vazurudekupolijikibon.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/93961150685.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/ralaxekinedasabapawu.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/161532223654.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_off0000be64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10884 bytes
SHA-256: 5ead653e83cffa6f2784eee3ec9b058e40debe2c88bd2c64b29a1cbd7a689a46
font_02_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 17176 bytes
SHA-256: c0c45458fcf349b817ada35126e0f3aa666286209525eeb70fc686d05d7a58c5