Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe76884593959c3b…

MALICIOUS

PDF

82.5 KB Created: 2021-10-06 15:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e2dcc20efe6f3ceaa336f0b64ebcade2 SHA-1: dc460a4e069a192875aa9efedf9e8091a53dddd6 SHA-256: fe76884593959c3b8c9b0826a5f4754cbae67cd5873d2af6bad18e50d9f18094
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/mategum.pdf In PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/73035783803.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/39784893346.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/bomuporirel.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/4736503016.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/8023931527.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/midibagelasasinena.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1615af3ea525cc---53609607726.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tuxak.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/pevubejid.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/86260874386.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/90322571060.pdfIn PDF document text
    • https://primer-spb.ru/files/files/99294703094.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/79619449365.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/91295714473.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6f1f47590b611ef64c98bff18782f252/26715305136.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161468930a2fe8---pumakow.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d5jtmnvsrknid1fbq352bjf7pg/54201852597.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/10722313040.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/petekutukevowum.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/sedisuvigab.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/68101684126.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fapupipepelesuwopenuras.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/75096692766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=croup+cough+only+at+nightPDF link annotation
    • https://easyown.ddproperty.com/datas/files/81822662109.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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 17880 bytes
SHA-256: ed26d4bf5ef9ac2573841c72eb19d958648dfb60ec91e5e59aa9db6ea36ff467
font_02_sfnt_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 10600 bytes
SHA-256: 3a55d54b12ac88ab74c2204721397bcd710c00630098ebadfa9ba30bb237ad26

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