Malicious PDF — malware analysis report

Static analysis result for SHA-256 879cc182e862d469…

MALICIOUS

PDF

115.7 KB Created: 2021-06-26 19:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7daa559697c497b2c5ac659f425b93f SHA-1: 0af6d003b26274a5debd1599d02caa604f273df1 SHA-256: 879cc182e862d46945a69eca1efc6bb489898b0392ad771d713a24958ca19a2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and trojan distribution. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious payloads. The presence of algorithmically generated URLs and links to compromised CMS upload storage further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://entone.es/wp-content/plugins/super-forms/uploads/php/files/ca6b27444fa6f5e391e3a606373b2342/fepepijej.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tju4c0r97jk1ebl83k3houhli5/larivenaxakafik.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eeb01aad7---12081057182.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/181cdeffc65740de54909e37cab3a35a/33992138886.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/42fo0vutv3a1v94li7s98tbh13/77999306053.pdf
    • http://archinfo.ru/uploads/file/18449340799.pdf
    • https://bandai-k.com/userfiles/file/69720536218.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/fa16bafae805978849e07c096d6b70d3/suwifolaxipogokob.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/k9o8vltplfhr007muhlcpkfq85/95158722810.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cd296b37e4a398023f5d91f666ee3a91/42012203063.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/98823757746.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4ae22dd303de50d5e1318754c9c43b0b/voruzopojariwipedel.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r343cgjvjiqvpfieql79aps387/93384951481.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b50e68cc---xukodidadajisafexirexas.pdf
    • https://dbjadow.pl/attachments/file/15580271938.pdf
    • http://eviljoy.com/UserFiles/File/82877968302.pdf
    • http://studioarchperissinotto.eu/userfiles/files/bibozuzupakilobusije.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5830254f9---xonuvoxabegofebuleneviz.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc8e48de---81185479640.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df90cb836f---vugelo.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8340c98b404d066e3894938b7de5bdff/sutabevedidejazanoj.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/47870832732.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/roboxek.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c07a3cc6f---25938649241.pdf
    • http://doo-san.com/userfiles/file/20210516150757.pdf
    • http://inlygiaylynhua.com/upload/files/jirojabopibuwapudebaker.pdf
    • http://klassn.com/ckfinder/userfiles/files/17505819503.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tle+module+grade+8+household+services
    • 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_off00016014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16014 16792 bytes
font_01_sfnt_off0001782b.bin
658e330ac5935162aded34fd52997ef9a1160afdf79e9239c85265b88f6a781a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1782B 10952 bytes
font_02_sfnt_off00019163.bin
d2f5bdec422198ba37b3ec153dfea61cb38c6029ba3c15782a51c513f4d7ff29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19163 18256 bytes

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