Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ff1cfceff00a3c…

MALICIOUS

PDF

74.6 KB Created: 2021-08-27 23:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb99422969aa5e8279b883067d98e18c SHA-1: fae94ba7a4569d0955b5a9b0bd77593cd94dad1f SHA-256: d6ff1cfceff00a3c88c60501cd3ccd2e814f24c3dfe6e246f676e721565e4ba6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution attempt. It contains embedded JavaScript and numerous links, including one to an algorithmically generated URL, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of multiple links pointing to compromised WordPress upload directories further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://archism.ru/uplcv?utm_term=cracking+the+ad+code+pdf PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092250627ea0---golotufemiximupa.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/riwisasepetotiburufaw.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f9d78a5cd---84719067737.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ufsohvh31c3djt8b13h82coppp/11706071192.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/xevus.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/045343a53bb9d5015098ee9763786252/21636170959.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/dijajuwususadixogiw.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/vobepuganova.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/1970a65cce5f18d41a8cd234d09e8143/xanerilibupudetuvo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kfse0eo94ipl0lmt791fcmu0hj/27312793543.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/74373800738.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65fb45235---lowevoxedoro.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/dac9da920c61e5a6f4f010704f408fcf/4853703625.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210611213143746.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/67361345716.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/83400133720.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611a879c01a50---1256325112.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/kojonanorifom.pdfIn PDF document text
    • http://yuha.be/_files/file/xarivixukawurowupazedobux.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/upo5eie4lb2sce20e5o9583bf2/divebizigepigaxejixono.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/suwumo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082772a3a9f8---dujavakep.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/b4ld9t6v3j8jqepnncmm32748a/kawagogadejutavajezatefal.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mo3210pomkk0jhhev3c36h3lq0/wesen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bafd9a495---mosapurajubivamezeda.pdfIn PDF document text
    • 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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 10808 bytes
SHA-256: a18c210d1bebc7ff8a9352462dd9b7cbf44b543bfb50835e25107ecc408db078
font_01_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16940 bytes
SHA-256: b45d2b66d1ba83a2c14071e6dd1222b2c413614f52a1b338d9d7ca4ef09bdd57

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