Malicious PDF — malware analysis report

Static analysis result for SHA-256 56abaf50bf1860f5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 04:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6c2adeb7a5d398365a0735fabe0712c SHA-1: 7817159caa9ead2be722d53066671be583097e8d SHA-256: 56abaf50bf1860f5646ef3f64297084c4d2be3997bd50bf3c0162c920d7b2c7d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into clicking on potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://zartmobilia.com/userfiles/file/20210722130829.pdf In PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4681045fdb---virikavomilevuwutidito.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116cba82d9e1---rugixilinijusu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210804_164833.pdfIn PDF document text
    • http://fitviewer.biz/files/file/64099688398.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/18654488822.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/furejiwanidisaku.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/8mmuqqpl57odb5mfq0v17mnnjh/81986384859.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/88285289989.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/vigoj.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/48957615378.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/77013039804.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/kubowopeji.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/10763437744.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b0556d7377e9dfb330116b98680502cf/manuniwobizoridakituxelew.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tulofojezesumijuf.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/70122863334.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/77033068241.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/wodilenidomomajof.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/93038617922.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/96414284386.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2698b19c6---duxigiritokajiboda.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc389179713---73640485579.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769aa75e3ba---35537395038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adobe+acrobat+reader+convert+pdf+to+jpgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 10804 bytes
SHA-256: cf90635c3aeba8084d36fe8148c6fb187667c407c7bcb8e768a57d0d0ec22634
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 20324 bytes
SHA-256: d1f2c14bb4f7bd579ebab56bb696d22b7e77843ab22d0ef4bd737b2dc891e689

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