Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f1131953097943…

MALICIOUS

PDF

85.6 KB Created: 2021-07-16 07:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a53e1596685fcf4eee28bd53b9b55ed SHA-1: bbf712a4b0e284deefb513631cb9fb8be623580e SHA-256: 56f1131953097943e213a0d541b276b99cda6013746f948a35cef6f2b47fd178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings strongly indicate a malicious intent to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/c2561052b9005272d9af99fd20aff484/68780995971.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/14833503526.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q263qadd9pk1egfibpvjav1tb1/96090054407.pdf
    • http://loaamtran.vn/files/usersfiles/files/rikinuwaje.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ca2d354d---84200244328.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1e4b5e46b495eeb270227876a9cd35e0/fodizewezip.pdf
    • http://auto-spec.ca/fck/file/44439300409.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a0fadfaa---24879166775.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/74jdg2hs54he3his9o4irkuhgj/pavipotatavosojodixamoju.pdf
    • http://citadelcaralarms.com/userfiles/file/62160728626.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a91d98b60f25436ecd0301e066f75126/temerevej.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073edab70487---14497320011.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1hfu2qacsbm4muers1a43r6prt/75905565594.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/iactp5l1bud9ssmi5ugt1mjch4/5184344002.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0sd5humbudrjllljh6ev1f1hud/35756678101.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s5vbp3uev2m9n55qlnsnp9hs50/54316535259.pdf
    • http://netisiletisim.com/guvennet/resimlerfiles/riwojarozalidanu.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5ca569e9---vuvugafuzewo.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hnfft84k3ghsol7nt1pnk79hf3/xojab.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/3c651df28172d3c7177a4c319a30f4d7/wosufogasutin.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/gekogaxomoroturomawi.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e5aabeafd3c---9081702580.pdf
    • http://graham1978.com/clients/79565/File/midifefutewitezes.pdf
    • https://alutat.com/data/file/gosofeg.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/19938172144.pdf
    • https://jackyrouxmethode.com/userfiles/file/3915568901.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gst+will+be+levied+on
    • 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_off0000ea37.bin
170aeada5af6e553398227a57091ce33a1184e0263b195269e34ed9d10a43c74
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10312 bytes
font_01_sfnt_off000101a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 16792 bytes
font_02_sfnt_off000119b6.bin
df2f2680c32a12ed771bcf04d7c82c6e1269d0b0c959d66448496fa025135702
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 17444 bytes