Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2f1e8c10c7088f…

MALICIOUS

PDF

64.4 KB Created: 2021-06-06 03:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a21f38f93177a73679cc95cae9d3aba SHA-1: 7a13b0c5e724fef7e5a9f6b25245964f9fe7e30c SHA-256: 8b2f1e8c10c7088fa4543eb47822edf66230d06c2dbf7a4b258758aa4e8219af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8721

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://laborke.ru/uplcv?utm_term=nombres+de+los+libros+dela+biblia+en+hebreo+y+su+significado
    • http://4grd.com/cmsimages/file/28402078229.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210531_4CA57EC917ED7E0D.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/04518edeeaddb51b942817a8ee336aec/tagiwovoxivavidibukafofub.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07a9baa94---xixalabapiwenela.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b7f9fe4d72242e5c55d5d0e7e1ebd446/3045349311.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a23a0a5a2---94926991670.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f60ee078e3906cfb1d3dd031151afafe/wewuzifubisetimakuk.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/36898c84560c2f3a60bd1a7f7f05ebfd/sifatolepapigepi.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3e8239d4---84493537103.pdf
    • http://lucann.com/Upload/file/31742881342.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1603b6ad8---bafojoluzepulojeditewu.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5ecceb80cf02eae907733864842b4640/41316863770.pdf
    • http://afgventuregroup.com/cfiles/file/83445680668.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0dd944f43---57559340635.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fec1a1ef43e3e1e460fcd2a99ff7071/nelulosozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e4.bin
ecbf852e696a25a149655c0f9f3dcb397a071db356ea5583f9f24db2dab22a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 5448 bytes

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