Malicious PDF — malware analysis report

Static analysis result for SHA-256 827cdb98866e6222…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 18:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5526e0167a91316bbad3c1d110c02818 SHA-1: c94109f77aa68100492126d02d6eb2b39fdb93c5 SHA-256: 827cdb98866e6222bc6a5a3f1a2f6d5ce22767c4b7d645f4c9ebd1cd612e5f5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including one hosted on compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage trusted-but-compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.lircai.com/web/inline/file/fumujagagiriv.pdf In PDF document text
    • http://worldcar.jp/userfiles/files/92957197470.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b19091eb---48611095009.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/83847048200.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/satonemim.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/nekisojerosum.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/3916123376.pdfIn PDF document text
    • http://newmob.it/userfiles/files/77378698827.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/68451279509.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905080924.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161343f6b56085---bafunuselovizenogewuge.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/4511485226.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/nefutupigilekizikeripiber.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/mekazamaril.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/bobaman.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161372640d13a3---47464475309.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/84127191825.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613701d24bd39---70752609225.pdfIn PDF document text
    • http://kite-surf.sk/files/40870081367.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zifeporofikes.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/5353513331.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/77128319414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=powerpoint+a+pdf+onlinePDF 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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10408 bytes
SHA-256: b5969523c700cdeb5c53b842575b9c053e4ebe9e0ae26e0482e6525540649e00
font_02_sfnt_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 17408 bytes
SHA-256: 67042ee2a1926417b559f3972ed809e1536f0020242d6a843032c44f73dab2ad

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