Malicious PDF — malware analysis report

Static analysis result for SHA-256 901e1237334f0e67…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 14:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9711bd114d1176878266414a63999e73 SHA-1: cac4a88f5e26653aad38b49bff3fdfcb3c998f7d SHA-256: 901e1237334f0e67914b534b623871ff8cdd3f5f9ce2f5aa08374b1fc3526baa
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and evade detection. The presence of a 'download button' lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.peltonfell.org.uk/ckfinder/userfiles/files/faburodubofude.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161482c21cc208---88652732504.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/99349220291.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/mivipotomonaxivo.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/pedugugasowof.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/7824093569.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6814da862---tuwutikub.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/labifexabajedan.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/53215238365.pdfIn PDF document text
    • http://mcutech.net/files/wonomobovape.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/31082984299.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/gukovarovinazutukud.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/nisesotagelugir.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/tofunogiluzuw.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/ripalap.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/71391807014.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/jopugopoxiwewejer.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a5b13e18---58426844725.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lusabopawanuvuvogijofan.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/52180586325.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/64597522853.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/pinowiberuwexowev.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcd3024d7---momajexerad.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/ginudimazul.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/88466656918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=money+hack+hill+climb+racingPDF 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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 10748 bytes
SHA-256: fd8e7f20103ff7287f760521c1a30455d319462a2c2cca60876a2952d51c61da
font_02_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 17968 bytes
SHA-256: e658322ec2957b5ffcb76fa75b7f84152a3db13f0d1194bff66dae5106bb6c31