Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ed33eef4b2bcb6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 16:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 37321ad2048f12861e024b64fe5fec33 SHA-1: 161de546e2d817384f3fccceb28eed9fc456a850 SHA-256: 39ed33eef4b2bcb64b575bce7a7b1004e36231ebaa3772d25f4e4c10237701e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, likely for phishing or malware distribution purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=apktime+pokemon+go+spoofer PDF link annotation
    • http://quartierdete.fr/uploads/fckeditor/file/ferolakavazedonux.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nepaxefijufebuvi.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/47011443300.pdfIn PDF document text
    • http://all-premium.com/user_file/files/bomulemopegulurowedira.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/83348754982.pdfIn PDF document text
    • http://elpijisystem.com/file/51020171686.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/banepozizupexoxolavu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614461a2d1652---rotamopenenusobezi.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/jolijezu.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/16869215832.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/58769308119.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gexajitumanukuv.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/21889121498.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/nesiji.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2708a1vc1o9aaibset2a165200/47451799069.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/60429116095.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/nerokonojobugogire.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366808d2b22---romudipevijigakuzisazat.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/91504478799.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/fopurigudunivu.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/78011253431.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7dumbrgk7ivf8thf9bjo2in23j/53337956506.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/sunimu.pdfIn PDF document text
    • http://bibonatura.com/ckfinder/userfiles/files/zugolo.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 17240 bytes
SHA-256: 1b052623128624fb00ed5db8c1b43d4d734253d41f5e21db90bced408ce555dc
font_02_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 10564 bytes
SHA-256: 54f1aad3a607d8644cc3a8d242c0b519ab47d5893b5acf87817c1f063176a810