Malicious PDF — malware analysis report

Static analysis result for SHA-256 061bfdf1740e404c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 22:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 486333b8b2bde94d715a3f6f5a4694b3 SHA-1: 40e8f6a753ffce110866cf10d4c4205816641a29 SHA-256: 061bfdf1740e404cb40b6e46c0c69c6000ad5c059efcdf96045656536b6ba5d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a9fd19e7---tagofaxetizuputevobagak.pdf
    • http://stepasidemedical.ie/images/uploads/file/nafafeb.pdf
    • http://wxdyzs.com/userfiles/files/54228001616.pdf
    • http://www.farmaciapenil.es/userfiles/files/23601949425.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wureregexorufatamudapizij.pdf
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/24576489265.pdf
    • http://kpdb.org/userfiles/files/47442385054.pdf
    • https://anaksemut.com/contents/files/89309046476.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/kawekovuzekadu.pdf
    • http://lsneotek.com/ckupload/files/53829111008.pdf
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/12565893774.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/50028335500.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/39190690041.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210916065909.pdf
    • http://ky-auto.com/uploadfile/files/nugopafogokujadifeporekiv.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2ebfcc5d8---nidiferolabadir.pdf
    • https://haisanquangninh.org/data/dulieu/files/kabikoxubobojoxazikekuj.pdf
    • https://marsanz.pl/uploads/fck/file/75991476387.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd08b6dfd---19597752627.pdf
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/22434820048.pdf
    • https://weborder.cloud/userfiles/file///tufabibep.pdf
    • http://swissies.lt/ckfinder/userfiles/files/gidejif.pdf
    • https://letajicikoberce.cz/userfiles/file/xusesarakojinora.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614eaf4cd4835---34584926105.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=raspberry+pi+4+network+monitor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aef5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 16792 bytes
font_01_sfnt_off0000c70c.bin
688f4b485e7e97bae739bf4054ad5d599ad77c61e079205a77fdbd8ea356b3e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 10924 bytes
font_02_sfnt_off0000e044.bin
cfa2032918362391ea8f6e6f47834b91c4c4143b5d82ecf125821b13d7cbd31a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 14720 bytes