Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78557204c361457…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 12:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5839ce915a34772ca330550923dcecb9 SHA-1: a285f4e289b4b54133a752ae1ce5963ecff05dd1 SHA-256: f78557204c3614574ca00ce1098c6c9e0e03a729368c48c11280b0a3584eb3dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=ikigai+pdf+free PDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/675d4819dee6355638c37515bdab605b/vetasokepa.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/32961622098.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/gerotofev.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d73cce468---jakarawivudiwekixip.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/wepulesi.pdfIn PDF document text
    • http://charivne.info/images/file/sukukewokeb.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/najupopidudukutafilu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/liserisizi.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fasoxef.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/77646698885.pdfIn PDF document text
    • https://theurbanthinktank.com/files/ruxinavuja.pdfIn PDF document text
    • https://pspgenuine.com/ci/userfiles/files/fabubanixarajuwoponisaz.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b0e81dc14db157c67a9052903de4a8c9/10961681638.pdfIn PDF document text
    • http://ijfbn.com/editor_up/jilasutuxumisisagovaxu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d3b139cc---pomasitusenokitel.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///guwezepudowogofi.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/28915967462.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c354d876---kofazidev.pdfIn PDF document text
    • http://asqcert.net/files/files/pugixiwixilatovagigo.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/nudojowalebaxikumasisolit.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210920151813.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312ce3c2a3c---61341808729.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/28886975516.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/xonuwewomupejibo.pdfIn PDF document text
    • http://skncn.com/u/files/48257449800.pdfIn PDF document text
    • https://durimawar.com/contents/files/pumoden.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/sugezidumesatedijerexax.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 10180 bytes
SHA-256: c689c47d9df3a416409e1596dfa2719b1cf272fc0f8aefa2078a679915397352
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 19940 bytes
SHA-256: 4da3c734cae7d266fbc6fb7b68c77f4a04cc43e5461313208278544228c099bc

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