Malicious PDF — malware analysis report

Static analysis result for SHA-256 e844ed9f4e8e67d0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 20:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 953b8713e8a5e5d72d6d913592ffc885 SHA-1: 6c2bdce477a17f65301d35e5fa6739f73bf599ce SHA-256: e844ed9f4e8e67d00389e84cfabc7e641dacab74c02438988d904a80beaae1ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/juzunogiromuxewuzed.pdf In PDF document text
    • http://mistral-paints.cz/userfiles/files/bugugotafom.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/5173687801.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/02568a2eec69247d319c2eef081d2b30/78871048652.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/nudavuvabalefovadapabi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/fc1e38482110cb310fdb8fe4c20e009d/61340329896.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/ranopojisaze.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adffb6055ed---rajanara.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1b5462e37---88613960020.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087cc59232b7---5254825930.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/tuwafa.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lodawukewa.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/puzolonetejatewexajam.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f699fa9dbe---31659080511.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62b182a350531743fc67d078bec8767b/10561008527.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/78296127503.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/11853914969.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1c1bb2fa89057ddd56ce9402cfc189e2/7980549432.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/99927504190.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9d651a10758069c75384f36c3e227cf1/vowezasokazuvubebuz.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/teujo1i48i3rmcsko5q188u1t2/36649438800.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beec419870f---dogizud.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6baee457c---61442780994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=eutrophication+worksheet+freePDF 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_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 18388 bytes
SHA-256: b92b908f76cd5208dd7f7a67db2cda3b1a73a9600a9b6d3831d3005b515a5635
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10792 bytes
SHA-256: 9fcb93c964eceaa09d32d373ff901bbd9c0076652a1973de4cd3247300184bb7