Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaca29761688a8c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 07:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65da44f83b126a8eb1399ee467659803 SHA-1: a5b9b1b2f45b6a3acf281e18864f056d07b2e653 SHA-256: 8aaca29761688a8c2f5231d539de000a10e2ce5d7853034bde5ea2f1a91ab8dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI heuristics and the link farm nature of the URLs suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7921

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=most+fun+games+on+play+store PDF link annotation
    • http://slr-eyewear.com/slr/userfiles/20210906232903.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29946538613.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/napaxapepuzowuvuzedopi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/58932244853.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/najikekabajiraj.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c8734a026ddc7717be1b2da4ff6d9c3b/64395662600.pdfIn PDF document text
    • http://rsst77.ru/upload/files/fezabiguzozolural.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/napiritibumujukefuvetav.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/81827663121.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/furijavi.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/7450918628.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141c77a64677---32953525447.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jejuxa.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/babekukevup.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/45781007984.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/57204292999.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/lajaluloxoribafavegofod.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/xalawum.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/96230377990.pdfIn PDF document text
    • http://unibox.lv/files/text/63666994332.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7d167e4dd5cd9475c01dcb51d10e46d0/71070271068.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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