Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb808cb0f0af615b…

MALICIOUS

PDF

78.4 KB Created: 2021-07-10 05:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80b3386aae34ce8227f78c8c4db5705f SHA-1: cb14e260b55dfdc0e80999ed5115537bbf3778f0 SHA-256: bb808cb0f0af615bef51957c7f7e5d738015ec2de0847bbedbf35eb1e7a0d4f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggests a link farm designed to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://drafthe.ru/uplcv?utm_term=reduce+your+pdf+size
    • http://stalmost.pl/userfiles/file/labowodemusorerajabebubiv.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/60917440468.pdf
    • https://iamtimeshare.com/userfiles/file/piliwumezeputesafibowaxaz.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7eb4d3fc45ea5d47bd68b5d035a6741b/karediru.pdf
    • https://sasalidayanisma.org/uploads/file/moziwalawexenofat.pdf
    • https://salvatoredivilio.it/userfiles/file/zoxezugojerevuwisi.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9qsjbkbln993h15ciie58j9oj9/92966706368.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/96501468508.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2f29cd0a457a46155141231882afad65/risijiwakaki.pdf
    • http://svsteinfurth.de/radsportfiles/file/10664017038.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de541e8012.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe16cff1d---97047601211.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e34dc5d69be---xijesivufulemogoravabojew.pdf
    • https://kodcomputers.ro/2664/uploads/misidisolosi.pdf
    • https://gerastar.com/userfiles/file/13648164540.pdf
    • http://strandedtattoo.net/file/77183941745.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/115e5478d2b0492b7f1e593dd31a4d95/sijenanopoluf.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/ca660ca9d4ec72c8dda3128d5af20c15/zajedakorajemow.pdf
    • https://mosallaesf.ir/uploads/ck/files/28576856060.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/gsifl9a0tnhqq8dvkhiilcuk9l/satinu.pdf
    • https://chmelo.hu/sites/default/files/file/baloginudijalelitawolos.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9d7318f9---totukezutenobubufelowoxiz.pdf
    • https://x-software.cz/data/file/62937591312.pdf
    • 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_off0000d066.bin
a4036f79edd5ed669a07e677f8a70a56e425f49b49a9ffcae3f391a753ad7182
pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 16908 bytes
font_01_sfnt_off0000fc8b.bin
da2e91d97ea4d532203f9949cd247758c31298507ef14bde6dad5509717fb5ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10520 bytes
font_02_sfnt_off000114a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 16792 bytes