Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cf9416417fd795…

MALICIOUS

PDF

77.1 KB Created: 2021-08-17 09:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c7947d27a76a6c282e9c0ee4ef70bbb SHA-1: 83f533cfab2e94305c3df911b7cbf8acea9a2567 SHA-256: e4cf9416417fd7958f4ce0d0f648ddbf3f859bef3d84c1c9d5075725c41e8c5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute further payloads or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 http://giprozdraw.ru/ckfinder/userfiles/files/vabibukotazizokup.pdf In PDF document text
    • https://cafesca.com/ckfinder/userfiles/files/96824519778.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b78f32c157be2bbcf29418734acbf7fc/dudidaxulewazuxud.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088449c9c7c3---zerisigenetomisoze.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/73097030881.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160737e01bf1f6---gozupazere.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ede188ada---puvedutigerapazuzedipu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd2e59a3ca466c6b12bfaeed3372b22f/50907748536.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/kepuzajomuvibuwipibavi.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607518ea57662---96284068631.pdfIn PDF document text
    • https://kede.org/userfiles/file/bogovipinele.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/66345663215.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0a20da24e86c92cea7854554f927f2c8/lujikobinokawodanitejan.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/suzudusukuw.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3hf0jm7av34h4dmfa7oto452h6/dutita.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/gatiselagiw.pdfIn PDF document text
    • http://jonellchem.com/upload/files/jexejizolurominitonewoma.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210726_2DC01E127AA6B47B.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57ec634c3---rilotugerisigazos.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/kuxifexevemogoju.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/mutugot.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/68663097161.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd7dc73bd---nafelujuvibure.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/vosuruvamalunivonevotawiz.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/lazibabedodew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=solucionario+del+libro+de+filosofia+1+bachillerato+smPDF 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_off0000c496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC496 11108 bytes
SHA-256: 2f1f66ae43d9bf856fe1186079650b89d11d2b9ea8dd2dba5d2738b0b27b82e8
font_01_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 17632 bytes
SHA-256: a48b5d098e1eb1cdac0fa812acebebdaba8965c009d5c97e720f30ad2d50dc58
font_02_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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