Malicious PDF — malware analysis report

Static analysis result for SHA-256 760715df41f32ecf…

MALICIOUS

PDF

80.8 KB Created: 2021-08-23 21:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d12ce16fe726e67746dbb92c3a42bbc1 SHA-1: 4fc21aedb05bb83a2b7d958f5ea4d89f56bef63d SHA-256: 760715df41f32ecf1dab71d288798ef160da4ff2ddf57dc44e3e39218eea913a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c71ec793cd7---69133457334.pdf In PDF document text
    • https://skinrepublic.vn/webroot/img/files/47527592112.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16108516aac3ef---sivemefelapoxixop.pdfIn PDF document text
    • https://areicon.com/images/file/gejiva.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/falila.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0797a2287---64414139789.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612341244a067---somesolo.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/fodutuwonejijalolaxenefa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e486ee15d---wemutesegeperawefej.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3043bec855084069889eb20467ce5cd0/lopides.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xivimomolitumibutute.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/bj3p84fin1j4rqjuf2t24fu6ir/duwativazuz.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ce9faeffbeb7e21c0ac94380d74e2da2/ninuri.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/dowome.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99fc8f9edb251e1ec77e471c7d8afcce/76044966900.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7f4bb190f561a921a8ea659563904634/jevujoluzekom.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/xovonowupeser.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/dobuxoxop.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/vudofipemizajekoda.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dfa2fb750b24b7d2e1d44de82a84bca6/gexiwasopowowexoj.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/92747088784.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/kuzezozawizusuralofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=system+programming+mcq+with+answersPDF 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_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 11196 bytes
SHA-256: 09fe2b9f4bef4d3f7fb99d9691091dc20358b99f616f1c225b1634eb93851605
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 17984 bytes
SHA-256: 1b2d66cb5f13521a83dfa84d40f3724a39fb11b0adcac9b2d52f75377ffab696

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