Malicious PDF — malware analysis report

Static analysis result for SHA-256 318bd6a80b691784…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 05:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aff4834ffee8fdb9ebbb4e2e813085ca SHA-1: 2519687af7ba75b1f50706e292cdfb747af6add9 SHA-256: 318bd6a80b691784dac38680f28bcad5ecde9fc698eb0547fcc137f6712c6835
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=lord+of+the+flies+full+text+pdf PDF link annotation
    • http://anpharma.net/upload/files/puvetevovefuravivuja.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitevatafutere.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161384983d37b3---80427805741.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/fafav.pdfIn PDF document text
    • https://energooptima.hu/upload/File/13199214480.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/19426805095.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16138bec1b635d---wedafisipuzepi.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/sitalinudegi.pdfIn PDF document text
    • https://majubesar.info/contents/files/wemezanudixoxagabatolewup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613525f20a50e---45638516322.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/90998659338.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/24416139702.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/fesafor.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/70344463834.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotulikifinowiripiti.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/rumawudejovu.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-21-45-43-76.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/lanetelonidogenajetas.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/32354940714.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/65097822759.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/41536931914.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100713033918.pdfIn PDF document text
    • http://myredm.ru/uploads/file/6035339770.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/8172596129.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wewotadelovifugiloresi.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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 10488 bytes
SHA-256: fda05d644754fc28bc62a866679e7f4fc8d4914e4746b59ddeda44299b6640b7
font_01_sfnt_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 15448 bytes
SHA-256: 9c295ff4c09932da5689cd5cb90855a38fac76b8fa11d26ba747bd975e33534a
font_02_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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