Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed82752ce658fb7…

MALICIOUS

PDF

95.5 KB Created: 2021-07-07 17:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9bbf04e16ba0b9061d4fd88824a3242b SHA-1: 83974095b0377182b38f93e5fb3d64e79fddceec SHA-256: 3ed82752ce658fb7cdf2d7666fed63e50101a5c673dea943659e01fe482059e8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

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 http://czdashan.cn/uploadfile/file/2021051113131773499.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec314261a6---16428349.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/80hqj1bfn89olmsm6f38pmves4/lawufeposawexijotovomuti.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7c711ab5fb94c30a56cf9a820dd8d8ed/25425056900.pdfIn PDF document text
    • http://unseretochter.ch/images/file/65568733387.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/17482649519.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c922664484b---tixigekitululokeju.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/108459331.pdfIn PDF document text
    • https://frpeteradeyemi.com/userfiles/files/tusavezakobalulu.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/2cbslq0oet2ltuaak4d00dgqg6/20881952545.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/77217228648.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/f7pa2fe546kfnm379d37dmtvnc/57307989545.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef001cd2c---vanudadimonedisetaze.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68946911731.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3fiv03octdts8s7cd3jv08jfk0/70527588649.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/roxamasamaxixedefuduvug.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10092181529.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d72f2119f54---denikabuxiguko.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/boxepezirogato.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kasologif.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/wiwujos.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085449f16942---muvixamumaturudok.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9f8b397216ee0bbd4c4e12096c8bd4a2/67709259669.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/arnosdi481cmuqhepbv5j14i7n/mapetabapepagokox.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f183deb5f7e290e7e6b6db3ccb6aa686/jixuw.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0151062a54---veganixamaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=glow+stick+meaning+in+marathiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d3fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD3FD 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10896 bytes
SHA-256: f4295dd37ce73a7be8ea2b7a2e77d1a51130f2171d4cad6279189d25bf6245d0
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 25544 bytes
SHA-256: 2c12370b221faf0996301be3befe3285e8aa0ed631a768e906b09969a40c7915
font_03_sfnt_off000149fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FA 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_04_sfnt_off00015779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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