Malicious PDF — malware analysis report

Static analysis result for SHA-256 888fc845b6a8ae19…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 15:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86ef09578f0510728aaa41ca0b9941cf SHA-1: de8632c78afb5a394de5ea75061b88cfd4ff6859 SHA-256: 888fc845b6a8ae196d70671eee7edede0ef624eb9fc4531b9f52c3187df9a465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://mlspoland.co/files/file/bejekukigabunitekusopeka.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/96843030375.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/renefupewapa.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/vakebafateneraramaj.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437cd064d6e---sanoretatabovodatew.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/21049150222.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/nonazatogomerop.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/v1u12mpl7j1h8o51rik099u7k1/ruzekipebaretodusix.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/81208344049.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d350e6838b866af945c212beee1c3b9/tidugixumomar.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/bizofedenu.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/zixugesovubipuwi.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/poporasegemivepu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/2448336505.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/20440326831.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/vobogarepetewovusagujag.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/65719131838.pdfIn PDF document text
    • http://keitbg.com/images/files/66827940831.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/dodom.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/28547797163.pdfIn PDF document text
    • http://beiks.info/public/file/xenikeganajaj.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/fazilixur.pdfIn PDF document text
    • https://tuinvandecruys.be/file/mowexozujekogevep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=electric+man+5PDF 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_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 10220 bytes
SHA-256: 5b8c7b2327f673dd5d5b3a7e4f9865e8f4108bec6ad2baf3e957ec80e93eb686
font_02_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 17236 bytes
SHA-256: 8c3b8cf0e0297c236c54752cbe99add2c6cd045a525422f5170a2667b398e0b3

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