Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66e0f4688e20bd8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 07:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aac11c0f039cf5874d15c367a029d340 SHA-1: 35f17fbd97fea801061420557141cf83fb54c861 SHA-256: f66e0f4688e20bd814f6e10926ab6ceed8269ad6d038e19f3dc1eaf19c9cc337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links indicates a likely intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/18dd70be0470562e11a76e4269f9569c/53078920899.pdf In PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2a89c98a---117340924.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/wulotux.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/tanojel.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/66713150360.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121b2912feed---75581548139.pdfIn PDF document text
    • http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/xunegewimalifuno.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/52232707183.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/23167841577.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/rudetoxoduto.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0ku4fujgcmqfdoioblcrstmhc1/11044057082.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/pavixokadajederivololana.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37874854017.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f34b2b20---nixowaxuzukazaxupuzeda.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/jositipukubuzapotujikav.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/dudatatukuwisowilaka.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/38553932688.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/8271515357.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/nimovakofabemi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/tupotebigisurovagofoxuwe.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/34909143409.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d295f1d40e---tevupabetaxemigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pronouns+worksheet+twinklPDF 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_off0000bb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3E 10320 bytes
SHA-256: 7c5d149e93d209c997256efe6af167a0a017772cd464ae83c53b739efff805f3
font_01_sfnt_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 16636 bytes
SHA-256: 548afc4029e1b86bab7d24335365562fbc9d75a3367511f3a1cc005b94520fb7
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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