Malicious PDF — malware analysis report

Static analysis result for SHA-256 d415cd782ffd72e2…

MALICIOUS

PDF

86.0 KB Created: 2021-08-03 14:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6a2e248a1745fc4838d27b5ac5f2f3a SHA-1: 0f7dfa64afac11467d0ccd29533d54be775025d7 SHA-256: d415cd782ffd72e2f6ce2e4378f115de18d33d5140e39ddfee381b6b55abbea5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9650

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 http://www.boldino-hotel.com/ckfinder/userfiles/files/38196856941.pdf In PDF document text
    • https://yellowstonewildlife.com/fenabenitixopasofijeb.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/32993686573.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210516052524.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/kowutefixexewusonuv.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2a52872edd41c4cc74485e15020a788a/taximoxogegilalenura.pdfIn PDF document text
    • http://contactconfiance.com/files/files/65649226070.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/xilinepuju.pdfIn PDF document text
    • http://henca.com/files/details/file/mavififatir.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/48149087569.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3cjualhtd4lmj10p1jc2j1mkae/kokofixepasugomimunuzuti.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/31859332535.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a41b32bb3c0---32842486978.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/614a84f809f54e66ee34643229425dc5/13479375386.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b10da6b6c02---sabogajukilip.pdfIn PDF document text
    • https://trexanh.net/upload/files/gosiwadivazodofutabegi.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///losujujexuzega.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609218ca147e3---84096992901.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/goligetono.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff181e4bd5---3455290696.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c38510932cc---45642386296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+bowflex+treadclimber+tc100PDF link annotation
    • 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_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 17416 bytes
SHA-256: 9b1b06f238e2e5d8370f9dca2fca17ee7a208f77c00549bb6f2f5f9a6ee83507
font_01_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 11124 bytes
SHA-256: d7ced0678dfc8539cf421d0b9af06a37565de438a3f979ff64eeb129708369de
font_02_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1