Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8115073faccbea7…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 09:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cd0bbfa3f8581b5f6a18726f5112844 SHA-1: 95b083ae88adbef40e1c4a6d1828008a99ef6db4 SHA-256: a8115073faccbea70ff5cf91ae5f0f153365d8f4a3664d91105aba9d51ba17b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.truck-transport.com/ckfinder/userfiles/files/60095227829.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/edc404fc8d77b8d4422a3689dc211cc8/fejosulanuwenavawutasofe.pdf
    • https://pima-alarms.net/slicice/file/sokekabuwaboviverozuride.pdf
    • https://grandhotelushba.com/userfiles/file/zademizi.pdf
    • https://rocksoliddesigns.biz/userfiles/file/doripujuzogebox.pdf
    • http://srilakshmienterprises.net/uploads/nimorodutinoligazoser.pdf
    • https://globalmediaminds.com/uploads/files/nowexisafenobimojos.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c29603983b51eeff076fd2fe8f5ae851/29659245035.pdf
    • http://truhlarstvi-strakonice.cz/files/file/63418447822.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/19464914217.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/5766610376.pdf
    • https://fnb-concepts.com/images/uploads/files/72574794001.pdf
    • https://dentalrud.com/userfiles/file/6574481761.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lleoagobchcd3adi9m4jmqfbbl/todedajosekutidad.pdf
    • http://dok-vo.ru/userfiles/file/7529715751.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/pasigodonu.pdf
    • http://www.alfapilates.pl/upload/file/71408123211.pdf
    • http://gaongonmaiphuong.vn/webroot/img/files/wuzixinujolokajagoxija.pdf
    • http://myjobcareer.net/userfiles/file/2021090615001373499.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/musibokavufemubugidugasu.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/roxolasubekux.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210907_091625.pdf
    • https://ykitraders.com/UserFiles/file/kibuzikipazone.pdf
    • http://xecuoihuyhoang.com/uploads/userfiles/file/86627876166.pdf
    • https://hatinhjobs.com/upload/files/bobelumav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+bluetooth+android+apps
    • 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_off0000ebda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16792 bytes
font_01_sfnt_off000103ec.bin
2eb788809e3ce4d49d13f9aedeac79ded25ba26a14864ebddb423166bf33e939
pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 18056 bytes
font_02_sfnt_off000132dd.bin
032bf31b521d298f601ab365b594d6362187fbf87a10371d54e45ed1990e11ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 10808 bytes