Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c2b9c4a4d3f66b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 01:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e85181f92bfcd93e53be77c75cd1f24 SHA-1: aecc8f41c01fd359eeb2bd4ed6e5a50ed51809f6 SHA-256: c7c2b9c4a4d3f66bd3fca1fd4769b97e2b50174917ad1c95a786be301749dbba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure strongly suggest it's part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/zotofavelegubiriguwugu.pdf In PDF document text
    • https://bestrecycledautoparts.net/images_i/file/93457747800.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db58da9f5---77914033213.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/94384138291.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062014525673499.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/filarebobadumoro.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/57616260035.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/taxazax.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff1beb058b---jujidivipose.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/18693974125.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kezutulu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/jobejuxejipasetorudafo.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/zalegire.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/80838548288.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/67b15a3c5370cb258b0802aa668620e6/89414097065.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d0498254f---sepedolukiniz.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8ea934ce5f50e99c52e49035b2b9eea3/xisojutabuxuluzuvugid.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b74281d44388e4abf74e5b4fb99bc1b6/74707890863.pdfIn PDF document text
    • http://faradbox.pl/files/file/wosivasumodo.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/93895462721.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jg0jerce3ecthpam1li71sa07f/39522163956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=simple+organizational+structure+pdfPDF 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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 15380 bytes
SHA-256: da6bed1f3118ce9a1f8ba4fd4b095ef1cf416a7fb6581ec76e0f9b8d920a5f04
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 11200 bytes
SHA-256: 6be3f0cd589f1510cdacdac41ede83eb1fa8bf77fa52eabf5db48ee89167802f
font_02_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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