Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c5c807f55143a2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 20:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68ad7496c804cc25c827453bec95a813 SHA-1: 811bade90ee6f21db72e84cb9f03dc0f2552cec1 SHA-256: 00c5c807f55143a250f8b154300e879f11e540c601a0ea3e9e902264fcc14ee8
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

Heuristics 5

  • 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
  • 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://livermore.com/wysiwygfiles/file/wamixuka.pdf
    • http://www.ondebiz.com/userfiles/file/marudukopomefedoxebawuvi.pdf
    • https://thisissati.com/userfiles/files/19504989634.pdf
    • http://www.saito-ken.jp/userdata/file/63567677.pdf
    • http://uchid.com/uploads/file/tifilaripitusor.pdf
    • http://sochisushi.nl/survey/userfiles/files/pojubefodajame.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/figude.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rrraoha6l3dn4k8j7i35k0pph6/jojuxetulizilujo.pdf
    • http://elektromig.pl/userfiles/file/tikokugeludete.pdf
    • http://twtime.com/uploads/files/202109100337274054.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18158791283.pdf
    • http://lnv-cnc.gr/userfiles/file/43447316232.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/dilunojevik.pdf
    • http://anoh.net/pds/userfiles/files/66236703618.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161484d10c8712---mufizosebonukofupalixemi.pdf
    • https://tp-pos.com/uploads/image/files/78904599861.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61c525871---84241728055.pdf
    • http://bakefruit.com/uploads/files/202109151432248473.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/15601881345.pdf
    • http://foto-recepty.sk/images/fotky/zosajimelaje.pdf
    • http://zhhyhb.com/uploadfiles/files/koveb.pdf
    • http://jr-bang.com/uploadfiles/20210904061052.pdf
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/23220820473.pdf
    • http://abbeloosschinkels.be/userfiles/file/luxopakokugedez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gacha+life+7.0+apk
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ec.bin
6620a9fd8e9a0a16e18c438847a652c2dc5aa7c2acab27d81f16e0885452f044
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 10356 bytes
font_01_sfnt_off0000fd7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16792 bytes