Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cd878c12fedc2e…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 08:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46b158ed32672ff2623970c14bac943f SHA-1: d86cfd4eb3122b8db068aaa95095f8f986b6ff17 SHA-256: 27cd878c12fedc2e81626ebcabb1c88479911226901aa3292989100d4a9e1624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/93d965d9f91f83ad73255963de2ebe71/bixikiwisikamu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/58795919756.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/900cfeda77801831f12f5ecf032c1b4b/39689968347.pdf
    • http://parfumerieindex.nl/images/uploads/45234285637.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e146584a9---40476762211.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d32d7e12a1b---44583173531.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3442367974---tizelirodopitobumatajo.pdf
    • http://buergerforum-tirol.at/file/26691651383.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b195506c2---wivuwo.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/24cfe7e03ec0e3977408782035d8dca0/96407076917.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbfe24f41a---22795009732.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791a3469b10---62462718977.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bdb27125a79d321e4212464b290b7cc1/28381897282.pdf
    • http://efuegypt.org/userfiles/file/bosuzixige.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/98s3jhmar6dssh912ugujkdom7/43728574080.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774a3bf834---76460849507.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/83b8693053ad4e6caf4caf1d9d0716ba/tudilupo.pdf
    • https://codecs.ro/images/file/59283735688.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fd31171f---13846357330.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/neletaruxubotepapogovamas.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72aae28438---42237268603.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54260d5ad---kedofugivan.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9919404609fe000674058585e98156fa/xufiju.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ec1e5a6f0ff73cecb2a7d759f452cee8/50325793323.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f858c8cf0---5362434121.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cooking+a+corn+dog+in+an+air+fryer
    • 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_off0000fe25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 16792 bytes
font_01_sfnt_off00011637.bin
95da2bb1980f3ba84fad41ca6a1d83d84748d1d5256e6357bac4d2a8ad1f3e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 17528 bytes
font_02_sfnt_off0001438d.bin
f551787705c22933440b89d32cd155645b03e690f89d3230551ef07e91998114
pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 10576 bytes