Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfbacd608f65f8a…

MALICIOUS

PDF

72.7 KB Created: 2021-06-25 23:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db9979ae54fb266ee63c3489ef214e6b SHA-1: a230213d4e41d82313424849def0f996a9bc2c6a SHA-256: ebfbacd608f65f8a1237fcbb8f0ecc514aeeea9f9af08f63fe57d508146f7318
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress uploads and disposable hosting, forming a link farm likely intended to redirect users to malicious content. The PDF structure itself appears to be generated by wkhtmltopdf, and while no scripts were explicitly extracted, the presence of multiple external links suggests an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7c3cd9c7c0b7c280fc754cc33af1eadd/34330995837.pdf
    • https://agmatbaa.com/upload/files/tekixonufeve.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fbd2ee325a6228894715efcf69efe6bf/pinipel.pdf
    • http://liburnia.pl/userfiles/file/44028031846.pdf
    • https://hospvetcentral.pt/site/upload/file/70431526448.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2dffed6a7---76645509726.pdf
    • http://gloria-eurex.com/97772617198.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb5d6761c---25326228034.pdf
    • http://tienhasteel.com/app/webroot/upload/files/33324008396.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6698e538ca---31373778512.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/d4841c5fdf62509e19604d9a385833f1/nazabub.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/85dc59d1a2f70b58e9e363225c6e79cb/liwogukopilukugujorusu.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/90cd002396b40690de971c5c846ce18e/joniximi.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160814aebbcfae---52639643905.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/74790843652.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bbc41aaf---2338646131.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/833a2b4859591faed1c133d9f4d0232f/30052505807.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc8e63b906---92949256874.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e3d4012e---24989885123.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2rjh5m9tnhs5q5ve5a2gj8o1be/91724604102.pdf
    • http://quick-thailand.com/images/uploads/file/28487968416.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3f0492dc234c98d1feebd318bffaf3fc/gapodusojokezegewowa.pdf
    • http://jump360.co/upload/files/20210610044613.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a777d7e709d---fosimuxok.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1916a51c---42057618272.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ce74bb863---66970510052.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=200+grams+to+cups
    • 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_off0000bdbc.bin
042c3d3ab75ab3318874621139a1fa0c8e0057ae00645e9c98fcf10f4bf365ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBC 15388 bytes
font_01_sfnt_off0000e552.bin
d63b7f6945af3f8c8aac708dcec0993736e0b8b8550a50d964058dd01f07eaf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 10588 bytes
font_02_sfnt_off0000fda4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 16792 bytes