Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7a3a6bf38f16be…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 04:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8ad05c01ce4f7b286c0d5432c7bbe87 SHA-1: f38e5e90bdeacc25af429a94af6db0ea2e2ff356 SHA-256: 3b7a3a6bf38f16be60e7cfe16ec30a53f511b80643414787ea4e675e4a588e19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee1709580---kipejerojasiwebaziwani.pdf
    • https://louvre.lv/res/wysiwyg/file/jawimoputakaf.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/djn1b9fsqo9os4s857tunuvb16/gogasexifojimaram.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7b60eae3---kapuzikixobiw.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb9536c20---kupikewixi.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd17b1a7efa---zakad.pdf
    • https://die-elke.de/cms/elke_page_files/file/10934405810.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777d045fed2---65209737397.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qqvobq6k90a7h619hh7vj8r9kf/zusesumoditiju.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4702255d338d1ed7e7bb540486a590b5/92121671210.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c4dc867c96021cc099f76ea2e3441c2/setedujusoxuvuzel.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dbc00e40e33512dc9f1e222036bcaeb8/nirozomew.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/miime19h6bcjf0eqjt3g576nob/rixutuzepen.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc0ff0490---80611236916.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816188b8a1f---57334321647.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a8f23ee2---73992881690.pdf
    • http://hurtmar.pl/Upload/file/14614960010.pdf
    • https://airshow-bg.com/file/sufowuzakefaw.pdf
    • http://border-inn.com/CKEdit/upload/files/83571503411.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pii5b8p5n36ra6oo0cl8939619/fijebekumuv.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/84541pss97454uakqgol7r1qgc/lisugabidujuw.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e01a7e8f78---siwasatipezinizavo.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f612f2575e---32948929821.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=health+and+skill+related
    • 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_off0000f0f2.bin
4405d4ef0cbc70b472d67597eac6aea729f950021233de32591fd5f1d984cf24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 10308 bytes
font_01_sfnt_off0001080b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 16792 bytes
font_02_sfnt_off0001201d.bin
e2b8131ae66820ef6030eab7ed3aff6d5b304b47a4122f7eb1afcc9961b19a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 16296 bytes

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