Malicious PDF — malware analysis report

Static analysis result for SHA-256 d878945105d226ae…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 23:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e2ec0bb423c0578f590de7567cd4cd2 SHA-1: 6745924d62d2fe932971a78ba3ad4290e9af0a98 SHA-256: d878945105d226ae4b400d544c5149d00c6634b6b853debc3778fa9383bad8df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple disposable or compromised domains suggests an attempt to redirect users to malicious content or phishing sites. The primary function appears to be acting as a lure to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiogallerani.it/userfiles/files/kinegan.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e337a49cd8---devuturubumedigaweko.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/wuzavitamajaditakeroxe.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_A91549371D5A206C.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/71989990379.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/kadipedo.pdfIn PDF document text
    • http://dhf-china.com/d/files/vixojewumabeduviru.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/nuwixatolatigive.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/96953800195.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/72465498803.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/ludipivenav.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/51442764786.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ciclfi39o22f0afvu1ou2di5n7/xewumujemeto.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8543ea778---55136277298.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/11938700181.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b683901cfde3199c55d88339e0d7a34/66084056027.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/79267573752.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/fufotozevuwapimugif.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/faxuri.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/vegusamadofox.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/20800501441.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/60083585954.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/17889459063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=related+t+test+formulaPDF link annotation
    • 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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10464 bytes
SHA-256: 76896c3bf4904347582a0fab61655b78e3557cb9bebed1b753294c485262989d
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 17312 bytes
SHA-256: 27cd82ca097d5d7adfc78f3c9b6749f9bf25e11c1af97eb2c5f455c5407a97ff

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