Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ad420977ab599b…

MALICIOUS

PDF

70.1 KB Created: 2021-10-10 21:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d607a6d9ee7e800dcffdc216cf9d20af SHA-1: 40524211116a08b020e62aea8e2084ab9aaeed23 SHA-256: c7ad420977ab599b15fb4b4f246e4b1c2215257604e881b318d0d97a69ab3e2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to phishing sites. The embedded JavaScript is likely used to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://irlanc.ru/uplcv?utm_term=create+a+system+of+linear+equations+that+has+one+solution PDF link annotation
    • https://labelmarket.pl/data/file/zidofelo.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f7673e19a696d8dd98ccd2bc371a534a/tabiperaraxeketiwupofo.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/wubowawusotojejutipatav.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zosaz.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/woporavo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3dd1added0660d66ee2c05055c831810/53229952566.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/46525762477.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/30196133793.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/83983289023.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/lopetada.pdfIn PDF document text
    • http://ipceurope.be/assets/file/89782137850.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210918_5ADB967A96BA44D7.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kekev.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/gorenes.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/tugazakegivulagazefevibok.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/30416446454.pdfIn PDF document text
    • http://vhshf.de/File/motatitifenifake.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161587f7994816---72151774996.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/zusov.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/21302714573.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/13300628111.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fawudetuwixemixaj.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/49527802935.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/fokasukad.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.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_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 15024 bytes
SHA-256: 19e310d6a8b1d1892bb8135a2921b2384cb19b56d608377f3fc9a625cc5ad49c
font_01_sfnt_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10872 bytes
SHA-256: 1e256e23963c3888284b0dba8f72fec1af613de56c67142f5c30d6448484394d

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