Malicious PDF — malware analysis report

Static analysis result for SHA-256 e642888b7b7bb66a…

MALICIOUS

PDF

96.2 KB Created: 2021-08-27 10:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b7545ece3bd1718db32e2192f6e237f SHA-1: e1d6e7d7179d86095458b3cef139da4814b41e74 SHA-256: e642888b7b7bb66aa8673cae2d752a4fedefc606169ec3bade357276d2fd94a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting what appear to be other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532d430bea---lonixarinupeg.pdf
    • https://curvy.tw/upload/files/82226040266.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9e222434---93293331225.pdf
    • https://motoquadro.de/userfiles/file/70771212782.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/01c2c1745a4a34ed877c6ba78ad3d2dc/90086067542.pdf
    • https://farmstead.tw/farmstead/upload/files/durugudigazepinitizeri.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/82bm7qingfiulopufdmgqgncn3/dafupuxelozudoxaline.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a071ea0a---wezusapajebivadinafux.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8a384541cb926ddc334d00c82cffa66d/dosazibu.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16090780ce322e---15433699551.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/eb1bca223331b1d76c001900ae9bbe0e/60905848106.pdf
    • https://xigmatek.com/upload/files/6166210864.pdf
    • http://kraski-chernila.ru/resources/file/pufoxorevubunulapipizewo.pdf
    • http://saltokisport.com/uploads/files/98711623684.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161124e1a7417f---lovivuxuxumexorunu.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c7630475---kepunoziromuruwifobenefu.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/bogagamoreviw.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/1346878089.pdf
    • http://aite-materials.com/upfiles/file/vemijo.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077273db63d8---89266540313.pdf
    • http://uk-finansist.ru/userfiles/file/gexusudawevedafanuses.pdf
    • https://landi-bg.com/images/file/manubum.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b794012f958---jidanumiwezesagabesit.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3590434e48---85357846818.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=causes+of+staphylococcus+in+female
    • 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_off00011463.bin
ad269201c449e7dcc4caddf9d3c76c748bf4d323bd80a70d14e10437d370f958
pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 17460 bytes
font_01_sfnt_off0001419a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1419A 16792 bytes
font_02_sfnt_off000159b1.bin
8a102ef42c0079d7af5bc38c66e69eb5022cb7457d5af07f286253590ab3d6d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x159B1 10892 bytes