Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aaa6b35fd92476c…

MALICIOUS

PDF

85.4 KB Created: 2021-08-26 08:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77dcd81da92a579454638af350d805ca SHA-1: 206267aeaa6b4a45753be917ef0a39723ff8fc83 SHA-256: 0aaa6b35fd92476cc6c13cddc985dcdc90d5832eadd7d64058da9f436bef210d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings of a 'link farm' and 'compromised CMS upload link farm' support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=grep+inside+all+files+in+a+directory PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/rbafrpneu3g6q5r7gqajm10i4p/gudetonazad.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/69274322922.pdfIn PDF document text
    • https://clubon.top/uploads/files/xasabagupuxesexilifuje.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/19082178955.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bhj6cn724ie3647m8977gmfkm2/67497247952.pdfIn PDF document text
    • http://strandedtattoo.net/file/80954530816.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a4646a7b00cf190800f029604bb97fbd/356933578.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/31154655934.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/70274915236.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b04329a2---92090266218.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/50077998336.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bee135da58---56525437856.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/1830061068.pdfIn PDF document text
    • http://isleo.com/i_photos/file/waselubaf.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/nurumowosubamexot.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef0552fb91---serutomuretezil.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1ab99ee9---risudazisaxevopemazega.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/bitoroxigupiteno.pdfIn PDF document text
    • http://kaies.net/upfiles/file/zeguzivivusewo.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/waxavukipaselolawezojak.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/48002353826.pdfIn PDF document text
    • http://jiab.net/userData/board/file/ludufuraxadudu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607745af39bf9---perijizozanuxa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/8cca7b66c823745d177b2aeab42df99d/98642817285.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0t7tts6o885njf14j0r4ru38k9/jusetitaboditem.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_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 10764 bytes
SHA-256: 082696f3157567f670f179ec85a8422e788343be27530f262ee4c1ff99091cbc
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 17784 bytes
SHA-256: 6d73c8125de24061e9457ecae11eff8afa992fa0137a49a815c9b392cc602e95
font_02_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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