Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7de2cacdaf4905…

MALICIOUS

PDF

191.1 KB Created: 2021-09-03 21:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49786ebbbf0159aefa6589dfe4f63f4e SHA-1: a40969d0fa2c43f0aba5ee5f66b65711ea5aa3f6 SHA-256: ae7de2cacdaf49057e4c1758c4df717bfc2564d79c96e1975b5616ae4128c63d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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://goodwill.as/userfiles/file/18970167473.pdf In PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/xiwutelobiribigomununup.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/97480149489.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/eqqdk7quock0276p8nkclmjev3/66856275299.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e6a31c47b74415ba2f4997f9ec69d66/10684759387.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/fuduxapezobuko.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/625d4232306b4a3695be2902e81d63ac/12305538109.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070c796f206a---wewol.pdfIn PDF document text
    • https://retta-bg.com/userfiles/junajixanalokorikudaduku.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/50200795960.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/79cb6c91f22b5cc690f4794240dbc2c2/35406675780.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a15811b41---88515298875.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/5806603614.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f1757765e70529579f45adc2023bd97f/89760681528.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5436af84---53114943208.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1320839df7---turobipo.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/bavimibubo.pdfIn PDF document text
    • https://successalpha.team/upload/files/12175616112.pdfIn PDF document text
    • http://gptools.net/userfiles/file/42469536155.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/44356403339.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31debe5db9---rometemovafezonefatawir.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/43523470780.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f606ced8---lugelezibamutunila.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/qof7b67ukqb58kb5viflj547vp/posax.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/35486099661.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/pakolibawosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manual+de+usuario+samsung+galaxy+j7+primePDF 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_off00028803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28803 11128 bytes
SHA-256: 617866942435255ad32e6d8bb25383355f37e216cc10ddb6620d96c171067ee7
font_01_sfnt_off0002a1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A1BF 19380 bytes
SHA-256: c8e91aaab56950342ea1973d65dfb8da1d5ff597ab3f2b2936418e88afef68ba
font_02_sfnt_off0002d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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