Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff25433b72afd55…

MALICIOUS

PDF

104.2 KB Created: 2021-09-16 16:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f0d3e5118ad702c4a10d23f7b9abc95 SHA-1: 213df10fe933bf39b7e00b6a0034ff587a0144dc SHA-256: 3ff25433b72afd55f9f03250257813eb83ed2ed2b762faa1e461f09602adad7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF structure and embedded links point towards a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=black+athena+volume+1+pdf PDF link annotation
    • http://pickup-ws.com/userfiles/files/42335595177.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/65cd564c59051b5d7f706fcb4d7093cc/bexisades.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/355125307.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/duxukuwanevotugi.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/9734526169.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/68613832875.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109031302171895.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/14e119c3110d18f9cb12ceadcce5b8d6/tuzibanegaziboxuxexe.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/63632276615.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/keniredabijiguzuve.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/medobilodexazakan.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/75882334062.pdfIn PDF document text
    • http://araratmebel.ru/img/file/37069375306.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/lugipijexabukaverimumajos.pdfIn PDF document text
    • http://clerus.hu/files/file/lojeje.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/97733069207.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9eeea326---tuzamijonimagosaw.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/49580671026.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/52131732696.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161314999cf967---63737648279.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/futike.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141352cbd963---laxojugemusejeriwip.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/81124157939.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613345925fb06---fobakixak.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_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 19000 bytes
SHA-256: 9f3fe84dbf11ba283482fe929725ee3052db1de05fc8f18bcf9a0a14e065fe77
font_01_sfnt_off000161dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F4 10888 bytes
SHA-256: b18a18a8a0b6ebb46bbf5829a83b09af983182dee993ba5ec2521eeffb9836de

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