Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf457786a8a2d6e…

MALICIOUS

PDF

155.9 KB Created: 2021-09-17 11:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7106ad2a16ff1b5add421b79fe80b12f SHA-1: 88e3e702b117ab68ec408ea16333809ac490e36a SHA-256: 1bf457786a8a2d6ecff01c50b9aa34e24bf7122694cc9d583a93ef2ac3a570bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://martom24.pl/martom/userfiles/file/piregesirazo.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7a0b90bac5bc013bea81557f64b05015/25092371411.pdf
    • http://xedaphcm.com/luutru/files/52911182655.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/falopadupupatenikod.pdf
    • http://www.zywawiara.pl/pliki/93304694642.pdf
    • http://lgassociates.in/uploads/dezirimozarasoniba.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614448f5eb0c8---79845314119.pdf
    • http://tythb.cn/uploadfile/files/10634138519.pdf
    • http://jandenzobv.com/image_uploads/file/38208035955.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/tutaliforabobasonakomalof.pdf
    • http://korvet-sp.ru/userfiles/file/bisegosa.pdf
    • http://mobilenmr.com/files/files/wapigibelez.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/vezalatibogegoruv.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613857b1c8056---6260867233.pdf
    • http://papianiarch.it/userfiles/files/3605689060.pdf
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kuzot.pdf
    • http://dezis.ru/uploads/files/50190292945.pdf
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/sitipukivitamuvezabuna.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/zoruze.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/57193560650.pdf
    • http://arniuniversity.in/ci/userfiles/files/38061251752.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebcd4326ad---ripugofuwobujixuzozaw.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/gadavajefetomim.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/77240489135.pdf
    • https://puntodeplacer.com/userfiles/file/kefuvutalotarekobojimal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=emotional+development+theories+in+early+childhood
    • 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_off0001fcb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCB4 16792 bytes
font_01_sfnt_off000214cb.bin
af76234dfb3a0552883eefbb2150fb397688fffe77a9b3c594e25b2f966b12a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x214CB 10940 bytes
font_02_sfnt_off00022df6.bin
e537cebd9669615ec9d8794d2e9a98fdf192f001a55c9e4f23f03a7a1aeb4519
pdf-font-stream PDF embedded font (sfnt) at offset 0x22DF6 19380 bytes