Malicious PDF — malware analysis report

Static analysis result for SHA-256 448d4ec4b6e59b85…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b8cf8f8ae9f6614eca9d10631d4ea013 SHA-1: 85ea3894b747a50a40ce5cdd4df0a0d570db668b SHA-256: 448d4ec4b6e59b851683afb3cf7b54d2cc506ac5c5a2f4f17487b5be1690df65
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/25743676004.pdf In PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/gavodizitakitojijubelapof.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/69950f544d7dbea8306122031fab795e/labukivevurixe.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/pedabig.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/pejawadev.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9dd7223c9---78529177718.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pexejuzelaxebudu.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/fidozuramixiga.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wutuguvirakasi.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/sixuf.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/rokutuzuleponikupepiziwa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f41dc85ae3a---tetifatodovexaluzap.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/vuxuwajibovojajizudigasom.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/gakowati.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iehlimc35ijbbssarosjsejt2/30727076775.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108171655047130.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/84162500883.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/fufapirebujigenevonewubaz.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/35927179247.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d049f9d0---71859977580.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/koviluvivuf.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/pekupeleweguvomitet.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ecb26455dc7---15706829249.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/ripulul.pdfIn PDF document text
    • http://lagrupacio.cat/file/42746406449.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/52252975470.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea34bc5588---zirijanasadekuvelabiduju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=advances+in+soil+microbiology+pdfPDF 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_off0000baca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 11168 bytes
SHA-256: 87f60d0f31e9e9d5104b67fafad2840226f495e309178b1db2c130db389a384a
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 14776 bytes
SHA-256: 182b43f9f34899e38c0758745d3d335887f411b3b8ff677fd9f076b2ed233918