Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac260516a348c75…

MALICIOUS

PDF

139.6 KB Created: 2021-07-04 17:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71f0a4a765907c507f805c453e141792 SHA-1: f698817cf23ff3d4007c67137b66a9225cad3873 SHA-256: 5ac260516a348c7574e966d035b271bec73096e56a02a8eb7fa4a744c47d7410
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample, but the extensive use of external links points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://smidgel.ru/uplcv?utm_term=section+3+of+land+acquisition+act
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae2b6f29d---lufizarid.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/pumrhpr7f6ku1hq3odvva5vc73/94799804055.pdf
    • http://healthywithhart.com/res/file/47105185775.pdf
    • https://pet-fashion.ro/mm/file/59131163655.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/48517908057.pdf
    • http://maihome.hu/admin1/file/farasafojib.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e117046206---sexix.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/69078ab553ca401f97558b973ac5f8cd/98257851498.pdf
    • http://www.manorbymajor.com/userfiles/files/99156080476.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d714ec55d8f---fuposab.pdf
    • http://praxis-greve-polley.de/web/editor/files/zazudakilaxagukil.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d11935386---85768562665.pdf
    • https://baoholaodong24.com/userfiles/file/wafaguvozalitu.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/16lh6g8m0dh2httvusmktjigb2/nulojodosafexibizot.pdf
    • http://whatdwellswithin.com/file/69013907467.pdf
    • http://lab4050.com/upload/editor/file/11093048192.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee9b2f7d3---xemutozoxusozerajososer.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608372808c03b---57272161843.pdf
    • http://xboxheerlen.nl/userfiles/file/rukozife.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0ee2befc---24095410143.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3a88b53ee9435cafa5d9c6278265efc1/2595834761.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160918bbbc8037---morilobawidi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8497740fd---82285767600.pdf
    • http://associazionemillesogni.it/userfiles/files/popobowiriwakiba.pdf
    • http://huucodatlanh.com/userfiles/file/93029520633.pdf
    • 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_off0001c52b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C52B 16792 bytes
font_01_sfnt_off0001dd42.bin
fa2548dd0af5179d46cb29a2c86245cd2c93238aa1d2b11fcb65ce90f7867611
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD42 10860 bytes
font_02_sfnt_off0001f640.bin
284cc24af5d0c206189a7c05bc4b2329ae6d76c909c86fa2c4532b1f6246f2a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F640 16300 bytes