Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c115cc48643c65a…

MALICIOUS

PDF

112.1 KB Created: 2021-07-14 08:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d4d9ef1717a4e348b5daa4030cc1f24 SHA-1: c6af966399be569c455fc0132c63892a24d764ca SHA-256: 2c115cc48643c65a15bb2d92e3aaa0eaf2de3b84b26ae439a583caec77d1940a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links pointing to compromised WordPress sites, identified by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/763df7910cf78e3d7c9715a8a92eeef7/zobikamevetiru.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097a32becd1e---pelikexamixukufujep.pdf
    • http://banghetretunhien.com/media/ftp/file/tolumejamujegin.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be4adb12c3a---29752291509.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45b8178bd---wuduzozopa.pdf
    • https://rybczewice.pl/userfiles/file/guneferuje.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/85465a94ffeb770305e0d1dbf3ded213/63419837314.pdf
    • https://tedvandergulik.nl/userimages/file/88520116137.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ff9f07100ea9ad9cb94d5ba92b2c4966/vukutekunotepiwumebo.pdf
    • https://alsultantrading.ae/userfiles/files/83988766020.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b304d9f33360c16e75b24a5f5896feb1/bedoronigifijefajetakoko.pdf
    • http://wisdomtours.net/upload/file/2487307589.pdf
    • http://bensonlandscape.com/editorData/file/38209985590.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a5433964b5bd902e7919b70e412d3f14/56000903383.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad9978fb5---49517623202.pdf
    • http://robwalker.net/fckupload/file/gekoji.pdf
    • http://keralabiblesociety.com/fck_uploads/file/nodimavej.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2c79d5c9aa2b6c17516bce6d7145337d/71773181379.pdf
    • https://advantagelic.com/singhania/downloads/file/93073306881.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd5a8c9b3---baromomivukusiwapomag.pdf
    • https://landbar.com/upload/files/51341793200.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a110fe4380e---85794064225.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/08ba0970d01f3ecdb7e97a3b67aa852c/2189391262.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446bf02ad5---rateropuzipelotapekata.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=diet+coke+while+intermittent+fasting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000152e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152E4 16792 bytes
font_01_sfnt_off00016af6.bin
ab2cfe7788da3f3eeafb78bb3906e7041d62d87420b9b4b68fa99ff57a248080
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF6 17448 bytes
font_02_sfnt_off000197d7.bin
e397e2af50af084f1b804373231fd37ba88a214ee5b85b92529c0ddd8b572ae2
pdf-font-stream PDF embedded font (sfnt) at offset 0x197D7 10960 bytes