Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c7d334d9a1e03f…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 11:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41632479235525761abab282bf9c4213 SHA-1: 508c894e8852fd13e4a91af3d73f2055a47401ec SHA-256: e3c7d334d9a1e03f9b6d707812f3f060e0e4468f7fb3e7f8fe7f868182f610ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

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://encoyun.com/calisma2/files/uploads/10662419847.pdf
    • http://ormansagszive.hu/upload/file/todegivajuleradiloxalo.pdf
    • http://seatraderhk.com/userfiles/18964649001.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dc062993d815e1958b6ff74703306373/1238649457.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/61122468087.pdf
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/77861131150.pdf
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/rulabujobesupigidi.pdf
    • http://gomsuhoangminh.com/app/webroot/uploads/files/26627490168.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12fe049d6---kigadabiw.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3da6a4e1ce0eac9c0dcf4068bdc321e/80285256624.pdf
    • http://studioschicchi.eu/userfiles/files/koravuxuf.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j9e7st3l4nrfo0opg6mlcbk603/nulevanobusojepowip.pdf
    • http://metrocars.london/survey/userfiles/files/doxametuvaf.pdf
    • http://naturalmis.com/userfiles/file/jepupafumezatu.pdf
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/61406775316.pdf
    • http://kbidc.kr/upload/editor/file/1630491261.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41aeb8c96---41494852708.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/61635387821.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/15748694503.pdf
    • http://sangtaoad.com/uploads/userfiles/file/tuliniw.pdf
    • https://revive.fashion/upload/files/jotagitesemep.pdf
    • http://swvocal.com/data/se2/file/83669784798.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161329c3bdc050---sagevirademofog.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/pazezemuke.pdf
    • http://taiwan-tsai.com/upload/files/dugexemutoximojuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+retrieve+deleted+messages+in+inbox
    • 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_off0000e992.bin
e8bafd630a4d4bd8ace9a41a2335a4a95b93a60bbe3087d2c5e8f6092dbaea83
pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 17420 bytes
font_01_sfnt_off00011640.bin
ff814dbfa16fcfc072548fe334ad5122ac02dc23624d1014d484de3e7e57b0b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11640 10976 bytes
font_02_sfnt_off00012f87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 16792 bytes