Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1a68f09c2d6c41…

MALICIOUS

PDF

82.1 KB Created: 2021-08-22 09:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a0771a0c5357a62ddc6f8e6df59d173 SHA-1: cee97d1fc4cc3ca1f3d3450b936670ff34f8fc86 SHA-256: 9a1a68f09c2d6c4119c1d623246f696760199db1f8748fa162ad4b4976ccc743
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities to execute code. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to malicious external resources, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://archism.ru/uplcv?utm_term=howard+anton+linear+algebra+11th+edition+slader PDF link annotation
    • https://fundacjanadzieja.com/images/wyswig_images/file/13741821274.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/46864750870.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b949a3a699a---jevunigelotuwejutetej.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/93935820453.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610506a54a860---52811233210.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3c7ab1816---rojikuxizevinuzodalep.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/rv35pvr85hcbnms4i5v4km5m12/98183234393.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20744618244.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/4626595964.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610b8a56e0bb4---sotizitebokemisimeganoje.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/novedo.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/66103725628.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/garuguvuterudew.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/10485615233.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lexafarowubovaruwaparelas.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8b8603759ceb7bda73930e19e4916b47/fisefolukugobimalamovawu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/petusebedo.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/94925410764.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3dmpr8q7t00qjllrgcoqkjl6r1/17771059656.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/34854661286.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160992d09ca3db---demazugifalagaxub.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/n45gal762q56eos6o5g1bhpdle/59230679748.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2c4b934ab5fa9b22967b89b6216b539f/80283249919.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/jirebirepigi.pdfIn PDF document text
    • http://cy2hand.com/userfiles/bozelenojadabe.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/janiwoduvizikanusamopiv.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_off0000df7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7E 10796 bytes
SHA-256: 6496e56d383fd1620bf73ef2f63f9a35f78f473ae00b9a8f433e33c96a06679d
font_01_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 15992 bytes
SHA-256: 3568e9e87b1232d0048a397b03ca1c063187859a9ba21861e5883952a20919dc
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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