Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09c165ff9feab22…

MALICIOUS

PDF

88.6 KB Created: 2021-08-04 21:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaf5adb8e5152a6722a400de8b0bcfe4 SHA-1: f9ee006ed6a316e66c86d5fd621dab53302211be SHA-256: c09c165ff9feab22194ce2467951b513cb2299ed79c76d8096851f73b159087e
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The 'SE_CLICKFIX' heuristic suggests a social engineering attack designed to trick the user into running a command, likely to download and execute a secondary payload. The document also contains numerous links to potentially compromised WordPress sites, indicating a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9b79f97cd2f7b13c7ca61a7895259f94/1559511724.pdf In PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6j7eu6mlarvcpes21mbqhculk5/9016720389.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/q7emlf0uoj29hitp5p3u3ulc72/mepoxunivor.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/18507160725.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cca2f5fb01ebc9f5c21aa360a07c1a78/zotavaberujopo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f1481cf94---85473915824.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/84152942933.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/rajaxuzuravov.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/e64f908fe4e06f2dd9e3fbd9dfe3eda2/vulazokoxugiwanogiwup.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/75799680463.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/88618418703.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/08c27688e02b255b1de71b6c3c2ce4f1/16012599242.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/89494692719.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/97243583889.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/7255d1fe9b802370b6ea42dfb316b783/pinitilemasugobafaratod.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/xevebolapupuwebijageva.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6303c0b372---sukipeme.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/bulomewij.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ed871f5---labadovub.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ceb466a4c---63871672412.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/43498620039.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/dojugetefegosonofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=why+won%27t+my+chromebook+11+turn+onPDF link annotation
    • 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_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10640 bytes
SHA-256: 7ac37d44502ab8952ae775b793393015c14ae44730c0dcec5e6139d69915bc5c
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 17064 bytes
SHA-256: 4e59847d3e9ee078bf47027bff7483a84577de056bd2c2668975f786510621b2

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