Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8352c5c794857f8…

MALICIOUS

PDF

96.1 KB Created: 2021-06-28 01:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbd06c7043e9fd27b612eb54a791c363 SHA-1: 73c94403d5f0b13e601b03f964c526d31b5495ac SHA-256: d8352c5c794857f8d9cbdc8baf5ace2faa0e0f29813ec33d79e21bdd19101078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://anatolianlgs.com/userfiles/file/tutixike.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8250990a5a81fa573e68b43142e3a10d/nuvinipurito.pdf
    • https://apsco.ly/userfiles/files/jibudeduxaweganexapax.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160757a8b35275---6216691703.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9vamo0co4jriutn606qgflugl2/radebivipabalerurul.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/u0vpb7o0r62020mu90eji2c376/zupumom.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3b41d1a362b9c50d8a902c0570e34490/68139915212.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0a64595840ffbab5fa0b4abd60d76f6e/jodawafuzetepaf.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6fb1ae4e9f90954cdcfb6cb21ee5feab/26614582443.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/69024469521.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sduouve1e6splu4c1uu175knjn/70673067181.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528192000286519.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/po5gankapavlfs5f6bdo787hfo/lusaripilok.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1623e0b97---64064710454.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jirede.pdf
    • http://www.urbanwaterways.info/files/65544162547.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b5c408d3363a423e3b80bc14b90ca9f/84293019638.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b33adac513---furufapirabupatulim.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7bdddbd06---34106016084.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i86j5gkkiu0kbf63u6dqbbr0s7/24257249129.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/63594dd764731b288193a9317e9dde5e/23862063953.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c91ce81ae---93940011277.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa45025186---42169134867.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=home+in+twi
    • 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_off0001092e.bin
6a841dd366b9252cbf847fffed669331236d3978829733177924b6410dc7b9ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 22832 bytes
font_01_sfnt_off000144c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144C4 16792 bytes
font_02_sfnt_off00015cda.bin
bbc348dcc7767b668d10ba9ccbc50eee6200898db8024a21cd78cd10d8df4877
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDA 9872 bytes