Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eed8a19c92819e…

MALICIOUS

PDF

94.5 KB Created: 2021-07-30 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 195551de67b411db493f5cf3d0083ae7 SHA-1: 6b9e6b2de6017bfd80db210ba2090c179cbbe131 SHA-256: b9eed8a19c92819e854fc8eeacd4664c68826ee0ca5608054a167e9077eb2054
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to potentially compromised websites and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into clicking these links, likely to download a secondary payload. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crysiq.ru/uplcv?utm_term=can+i+get+a+business+loan+with+bad+personal+credit PDF link annotation
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210705121006.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160989750b73c6---xuluxoluwa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vebowalamezamezajutijuzam.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sopubasibovekijotuk.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f288341032417f35c26d9222e97aebec/33979887079.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aa34f39ec8264a517b68a3110bf499aa/nugawedeketukuturoto.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/21609035924.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/86007875042.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/69992440285.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/10013026692.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/69153256226.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0484afae9---71520896559.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/xotifazejisoduxirasofip.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/83ff7b9143edc72fcd321e1943da9a46/wogumejekudikukigu.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/nezoda.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/g8sdqaehhm1t36g2fa6rr56ht8/wivivabamupofatow.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/23713150247.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/tilenidow.pdfIn PDF document text
    • http://standdominica.org/files/files/39407162886.pdfIn PDF document text
    • https://egf.tw/test2/images/file/18729620191.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rfvgi1cbbi2tt2mi932aqriptc/28674088858.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/85753244969.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/6fbfb4e536c42464e91486f29d244071/55361114068.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210710111102.pdfIn PDF document text
    • 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_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 11152 bytes
SHA-256: e135d8a185819116d8cc1683e18ba9447c3c58cb494013ceb53b7474fd9c198b
font_01_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 17196 bytes
SHA-256: 4208ff361fc1da43698284d55e9b3a5fa2c30d6db98c0acc82dd13449a47605e