Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa301981a20b6fdc…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 19:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b876dea142b758ebabd522075e6846c9 SHA-1: 032ec09dd6141200c8b42755744dbb118f0878ef SHA-256: fa301981a20b6fdcb6c7c8e6df8c05a9c30c5a49f0f56b05ace49a0cf7ef348d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs, including those pointing to compromised CMS uploads and link farms, suggests an attempt to distribute further payloads or phish for information. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=offline+games+free+download+for+android
    • https://office-agglo-larochelle.fr/userfiles/file/xirewufiluzusaz.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/107d9d20333b7d2815b53d5cdc488fc9/gewomu.pdf
    • https://kalimati.in/userfiles/file/67832611259.pdf
    • http://quangcongluc.com/upload/files/dafukuzila.pdf
    • http://tornyanggrace.com/upload/file/foxepukobasojapur.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/49246518482.pdf
    • http://airmon.hu/images/files/mibewegadavewajigopu.pdf
    • http://docando.es/js/ckfinder/userfiles/files/45656643320.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/58515231895.pdf
    • https://thietbixanh.net/uploads/files/lamafu.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448713bee56---49420269580.pdf
    • http://astorandblack.net/emailer/userfiles/file/18340478183.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e237a26a3---jamoraxokuvew.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/193050ebbe3df730b7291dd5b85b1fa3/48400067676.pdf
    • http://faisaltowel.com/survey/userfiles/files/15102355821.pdf
    • http://vititanon.com/user_img/files/64061116405.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/78382171496.pdf
    • http://pravkniga.ru/files/userfiles/files/dasalarozatejuripolaji.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/68164950743.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4d75ee8d---10502907382.pdf
    • http://residencecarlofelice.com/userfiles/files/sewufoloseb.pdf
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/nenuporixaz.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cd0b08c27---44262366987.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/2129244007.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_off0000afb7.bin
1a398238e977ef00fad1537807e07eca37e6e0e2dd46f1799c779240875dd4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB7 15260 bytes
font_01_sfnt_off0000d681.bin
662ccad50f90b0a313560362069242e2f2549a2744b75ca96ed4573e90bbbea4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 10712 bytes
font_02_sfnt_off0000eee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes