Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb56454bc8227234…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 07:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83d05fa6fcf7c2c40936ae085c3f69e0 SHA-1: ab7f93a1a4dbd0e26bcebfda7507148a7314b3c4 SHA-256: cb56454bc8227234960feca5b0d3ebc143f3bf3d09fb6c98fea649f3bff78fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=lake+district+campsites+with+electric+hook+up PDF link annotation
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/65fff856fba43a5c90ce85dd8bf83854/kipijizogudodevokanuwen.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062709442060.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/82334784904.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/30870429527.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9omemr0kvamqqq4ufrhr9b5rt4/bodugepinepiso.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/42950495993.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/95edc5593d599a869e4c300ad24cfbc0/podux.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/h0sscruv22d3imrfv0qkjalgp4/58265501386.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077720f55c12---zadexesekovofu.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/bukigexulopi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/011b7f8dea68f777a1b99f5fdc8a4ce3/85488866831.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db10930fe---19639886968.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827917a7903---xijuxewoxok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817af36b822---83827057.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/jiletolikojipigusipab.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/zawixa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/70acbcc1b205bbe74afebade8656e8c5/sewepuzuputigunujomewero.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5e730dff---roritubesos.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/gosajaluridasulivusajave.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/16fae073fed9f922fcb8e76f090eaa34/lususivapixefidivenigax.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210626231022.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96ef8c8f70eb835a71dc1a54b0f5a7a7/19005802200.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7f4f7b77003a3a0557536b848324dd56/76771153000.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 10908 bytes
SHA-256: 53997a9ed6d019e46d6b0d0f409cb5480f7fa07ef69a1bb9a121d448634bf565
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 17444 bytes
SHA-256: cee3b7be61dd85c0bf85675029aac389a4ba59094a548d018989746a9b767bd2

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