Malicious PDF — malware analysis report

Static analysis result for SHA-256 9921e262af038bfc…

MALICIOUS

PDF

71.7 KB Created: 2021-09-25 10:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb86245608c92996b8b41efa2a772258 SHA-1: 8147e4443f470667bbc6395bdd8767420587d1bb SHA-256: 9921e262af038bfc8891423e1c3b022132a4f289c9ee13c5648a6a09f91f849a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://ytdrive.com/CKEdit/upload/files/87446145285.pdf In PDF document text
    • http://serdceprirody.ru/userfiles/file/zidunukudelafodo.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/wowejawebulepebi.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tadafopa.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90573749481.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/nojirezis.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/jerojirosogexapafedidutug.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb349f1aa---risefipivedasorefo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/35782420177.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/negiw.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/54737926843.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3961dmselu8g0njlcndac5q26h/rususeborudop.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426dc36ff19---mipisobofigepojeva.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/15061347829.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/fegusoxedijugopix.pdfIn PDF document text
    • https://signika.pl/Upload/file/xedugejivawikogir.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca13d93862---50441812819.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/14433055506149469450531.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7951eb3bf---42687393032.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350621cbb5e---99499998379.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/74444673170.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/bavejorigijizaw.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/vuwoderazamitajixonesakon.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/90395727687.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/tovibivi.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/78865188853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+editor+pro+change+package+namePDF 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_off0000b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB6 10820 bytes
SHA-256: 0ada2ce9988bf0a8a16f4a998ca280c7e1469e91698bf503e377f1a342f9f1d8
font_02_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16840 bytes
SHA-256: e2d81f5794e3f8c965879a4ede1e364b292cca517d76e837e5f21fe4ec789102

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