Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6ed8935aaeb4af…

MALICIOUS

PDF

74.5 KB Created: 2021-08-26 14:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a4ad9f6997e142ba4ce5d2d2a607fd2e SHA-1: 2f4875575d053e1584b3832c37a7766ad822c65f SHA-256: 7d6ed8935aaeb4afc48027411d375ab62ba98bae33df69fdd540a98467f95cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=spiders+pictures+to+color PDF link annotation
    • http://inciboya.com/resimler/site/files/209721942.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/579bc9b56308d5a3bdc2b92ddfa7688e/20885357105.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/vukumujimavijodefuju.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zalopipov.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/waxeba.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d247d7655---lidepenegefulusiwudoku.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/11537630335.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/96792057594.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/7199222382.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/45152823324.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/70078018708.pdfIn PDF document text
    • http://zuche0551.com/upload/file/95966754759.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/62344521961.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/taminigotifab.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/426j92nqmrt6t5lnfa9f9tuo8k/63625029689.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zajofapobexiwuluz.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6a0c6fc59b0be84aa2e45067a7a70a80/41070493633.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/82987834774.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/penozutolutotemevav.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bf970f97d96---bekadamuvejir.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7cf2c9fe---zidawafugelegaxiputone.pdfIn PDF document text
    • https://oversaslogistica.it/file/metadofakuxopizebiga.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_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 16300 bytes
SHA-256: 1fff51bcc80abe905f94c1005b41fc4666ad1b505cac6faadf19a098e3b9dd30
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 10416 bytes
SHA-256: f1a1d2f95cafd927c76e58a7972c5d4ad9d97bc5935cda4d430830f6a79f9137
font_02_sfnt_off0001045c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1