Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5407a18bfa02e5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 09:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8111298592801796eaf17a312333f5da SHA-1: 519a93aa5581a1ff8ba3c1c3c4bb4389c1bb2f17 SHA-256: ce5407a18bfa02e5fd83878b1497083a8bc569e550668f359c2f81fae3de8c07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also hosts a link farm on compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6197

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/99c4902a2ebfa87650f4fd37d46548e7/69363462459.pdf In PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/jopisinogesijibak.pdfIn PDF document text
    • https://medpressa.ru/files/file/rinekerab.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/336965028ae1a601648d9c4f618545db/13444403002.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fogelotukatudufose.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/10100072110.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144cb07729d7---mamepusofukekitomidawox.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140378b1c420---jipupotenafezunexa.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lotiborolal.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9q6u5d0tbt38k7jl0prjtqf3po/lotajazezitofiviwiz.pdfIn PDF document text
    • http://indexone.ru/upload/file/41712443116.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/89584638010.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/kidowixisisoxi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/43999762919.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/mudikufefeko.pdfIn PDF document text
    • https://masukpt1.com/contents/files/nokajifasewidepodetapin.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/ruverivak.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/55799579592.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/wubunumi.pdfIn PDF document text
    • http://rideco.hu/upload/file/noxajopez.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/tekowevafekujebekuf.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/47100558386.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bogatuwixuzaz.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/kofokukamitibeni.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/54730689859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kotlin+activity+lifecyclePDF link annotation
    • 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_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 10232 bytes
SHA-256: 4391270afe9ea279a14769f2d99609b7a526498946718222777a457783bff8f5
font_02_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 17080 bytes
SHA-256: 04766a6440fb8fbf2e0df04327a6a424a473e9ccfcf87958d2a2e59419fddb10