Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38cb1558fb7cda8…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 01:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6fc91608e4ecbec5e2e8ace2314bf9d SHA-1: a65922aa5bd181b83c4850963ad900293423a193 SHA-256: f38cb1558fb7cda89c0298b42b4b13a5c89fd2aee4ed33c91c1b94f16e63cb12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=equine+answers+horse+transport
    • https://jackyrouxmethode.com/userfiles/file/29352741752.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d63132d04fc2e6753cd62d57a44c10ef/54558855826.pdf
    • http://kodemari.info/data/files/jebojojoso.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c40de1de8f---nagoza.pdf
    • http://sial.pl/galeria/file/jotikutuxomawure.pdf
    • http://ural-resyrs.ru/data/file/ziwudori.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b57a49fcc4---lovadirejazurerukafoz.pdf
    • http://doktor-okonski.pl/uploadimg/file/51903334012.pdf
    • http://crmrealty360degree.in/ci/userfiles/files/fuvovu.pdf
    • http://garageanything.com/js/upload/files/27227423585.pdf
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/51672092446.pdf
    • http://ridendo.cz/files/file/lowejotodudokakoxi.pdf
    • https://arerp.kr/data/file///zigifafinujufutasefeti.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5babd679d10db5b422b1821e7450c116/wuwodinutefo.pdf
    • https://najlepsze-w-polsce.pl/uploads/78463745826.pdf
    • http://rickgrisolia.com/userfiles/files/86753929939.pdf
    • https://lentes123.com/aym_image/files/25318332825.pdf
    • http://thepducphat.com/upload/files/tuwubopiguxubuwet.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/zezixofezave.pdf
    • http://rkmaster.ru/uploads/files/17717611351.pdf
    • https://ww150003.linebot.net/upfile/files/20210912065923.pdf
    • http://www.moyekolodin.com/files/jodurixegefamimewenujo.pdf
    • http://freeski.hu/freeski/file/13020052218.pdf
    • https://aynispirit.nl/userfiles/file/89546590983.pdf
    • http://stisk.com/file/65551322503.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_off0000b302.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB302 16792 bytes
font_01_sfnt_off0000cb14.bin
785d1bffdb5484ec19605a48f3dace02d23055e6efa7515e252d1d55bac1760b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 16384 bytes
font_02_sfnt_off0000f4ad.bin
d9b6effe3394b18848d5f2fef3ad106fba87373fdaa74b3322e8e699e6fa6f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 10620 bytes