Malicious PDF — malware analysis report

Static analysis result for SHA-256 111c8cd8fcf4ffda…

MALICIOUS

PDF

88.4 KB Created: 2021-07-21 23:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01ea45833196bac22521bc623dd12b79 SHA-1: 7e0176d0b5421a00d8084065191ef14addb5ecfe SHA-256: 111c8cd8fcf4ffdac786d1aef56d2dafde22c6647a33642e1cc670d050796fe9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which are hosted on compromised WordPress sites. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7fd13ef040b34136e81201ea29bdde5b/murifemuxijupuvalak.pdf
    • http://alacarte-design.de/userfiles/file/timilulapu.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e093586c---lefizunorisiripox.pdf
    • http://perles-del-beya.com/userfiles/file/43057195732.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/r33ilj55qmru17pefui1ru4kkg/baxililozofizeguzan.pdf
    • https://thaiwoodengames.com/files/upload/files/dazetujoderoneligebariti.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf30e6e021---43862898106.pdf
    • http://daimarconstrucciones.com/images/admin/file/74109680421.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d8e2d2ac---77645651780.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748b2b1c99c---debup.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/41869334769.pdf
    • http://ipceurope.eu/assets/file/69941582459.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c72e452b1e9---kogabizux.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558d780319---tukekirimetisoxojaj.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f08fb54929d7e19ed0d66708f84e85c9/zubolekogurubotezuxaruwum.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ddfe0bd12c6dfabd6e7c90bd2398281a/domufagajizewekubadam.pdf
    • http://alexandraharris.com/clients/36054/File/sisoni.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1cac045a082b690ef35da4d238d5bed2/sudowixuriteker.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hsse8aum61is6b17bcdnmaq3ro/vosajeje.pdf
    • http://jump360.co/upload/files/20210716212957.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/86032092099.pdf
    • https://mariellatriolo.it/public/file/wawamomeju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=business+organisation+and+management+chapter+1
    • 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_off0000f388.bin
57859f68db34cf3b2ddf0be4caa310f4e1e98139f7d216f6310c67ccbb7b5525
pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 17248 bytes
font_01_sfnt_off0001209b.bin
81630c5640f82e931ef5a90cd6791eedd2ae8501869e2f1e1ddbbc666f52686e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 11120 bytes
font_02_sfnt_off00013a4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4B 16792 bytes