Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5b46d9e701613e…

MALICIOUS

PDF

124.6 KB Created: 2021-07-03 11:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2cf3e7a41e1a96c56909ea44da837371 SHA-1: 95cfbff99ea06e20cf59f0828fbedb199943b87f SHA-256: ab5b46d9e701613e0da6b3be9cfde43b145408d4ea6fea4b4f9f9b501ac5e058
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content, further indicating a malicious intent to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c740144eec---rosejixilivukifenikud.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/eca00e959e0ba3dfcad26b35eeac9513/pawakat.pdf
    • https://aedwea.com/upload/foto/79520538363.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160828edb2aff4---40255518973.pdf
    • http://artpolinakuzina.ru/pict/file/fozutuxoresopu.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e5cf57a07---zevidokifemonijidep.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087918c000e8---goviseropugijepuxezupobeg.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f531da41---jetarobidugodugobogo.pdf
    • https://capecoralliving.com/media/file/17561759352.pdf
    • https://armagedonspedycja.pl/files/file/35959121485.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be14183faf5---xuxamok.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/15700362452.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/larujaluwoz.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/38e068f0f648addae15b97a20c00159b/nebemonejebumaboxakugule.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o5t37gqe7uo2hgajuvcbkopuq1/vodupokog.pdf
    • http://studiomilano.eu/userfiles/files/vosubotinakajovabetax.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070325d62477---83533719893.pdf
    • http://daiichilogistics.com/uploads/news_file/fegavapikofamevol.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb3a0061a---51625609489.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/k1p0js61p0otmgdh5enosug15a/vokoxanafilujo.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/nisomap.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6aab31a02ae2315a181cf43031951c80/gotokaxiwanepabekoxani.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/38d4dd3cc3d5fc229f68cc3c9105b0f9/nojidamuwuwemarejuzimaz.pdf
    • https://tylbm.com/Upload/ckeditor/files/zujuvirasekodevemi.pdf
    • https://creativitagh.com/pevron/www/img/file/wujot.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=use+hopeless+in+a+sentence
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/61ad0f83443cedf6b36e45345d3a8e81/sadogubowo.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_off0001862d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1862D 16792 bytes
font_01_sfnt_off00019e3f.bin
ed72b4b70645f1a7f2732ae71806fb0227266d92d0d03cffe54395571df8bcee
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E3F 18100 bytes
font_02_sfnt_off0001cdac.bin
612adc8469a47c44fe9b1356d8ee4f02426a5f944a5566531bcc0e0e1a28a043
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDAC 10380 bytes