Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb31ad3e48d494…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb60d746f6693df8f36f5c443ddce6e4 SHA-1: 3032801c849c8ebbb042e2039be3d79b8480ba67 SHA-256: cdeb31ad3e48d4947855276a59cff74ed1e19a3d9719d88aaa99b3acbb2ba110
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc044c6b4e---21148649188.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5216e08f0---volejita.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ri1i6ld9i135211cqkn4rskai4/24114010024.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/69840ce3f25f64800d7874f47f53717a/77668437576.pdf
    • https://lapalettedesarts.fr/gestion/file/67123757226.pdf
    • http://sgd42.ru/userfiles/file/48112690138.pdf
    • http://bawaconstructions.com/editorData/file/xidajoloxivuruwuwebite.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/03ac75a90f2b1a0fd78463758a0ae8d9/78496170770.pdf
    • http://notarbrazda.cz/userfiles/file/31658000906.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/14efb9f98d0ba0748ddc90965e0c2986/96697069183.pdf
    • https://toskov-yordanov.com/userfiles/file/9209286379.pdf
    • http://studioassociatoemc.com/userfiles/files/69807568739.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/70cc7641a710079b834a0451ae191165/61290550349.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8422ea755750316e98f06776211ac906/kukewerevovolarazunavawo.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/daff3fe7b121e5c1712e70c368b2865c/70708267358.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a477e7eb011---8862118442.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fc54021a4---xodorivogusunipeb.pdf
    • http://mwflower.com/upimagesfile///16284549832.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210517234727.pdf
    • https://telewebmarketing.com/FCKeditor/file/vukisokutox.pdf
    • http://duonglaohanoi.com/userfiles/file/temuxogoxokixoruvedeb.pdf
    • https://topinsolventa.ro/userfiles/file/velazomabuduxokawenizizi.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/85237b10e1f2c942f5aee1616a2905af/17247817395.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+nintendo+ds+emulator+for+android
    • 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_off0000ee05.bin
f65c7982316b5ba9a263a04cc7d754d135d8ed77a90471201b22cf929d04c7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 17536 bytes
font_01_sfnt_off00011bb9.bin
954a5dd06ad48ef337c0b4956d5db59aba5e004b22f38df548832c32a6c2de28
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 10592 bytes
font_02_sfnt_off000133de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DE 16792 bytes