Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcdcf949d8c6ae8…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 05:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bc363daf81d145c7f402817da6131f5 SHA-1: 2102138a2625e1f8af28fd7c17d8a10a0fa88f9c SHA-256: dfcdcf949d8c6ae82c4c6aa02b368822cd2f418f1510579d335722e68fb2aa8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the presence of link farms and the malware detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • 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.
  • 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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df43036b3---20333218554.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/k1curtuam2m1203rgt4ktgm3vv/98818263249.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/99013469179.pdfIn PDF document text
    • http://air-ned.com/uploads/files/89764273240.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202108190312441376.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/47525468602.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/45426861251.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/35e22138ccb8c5080805ce02508bd5f3/50182841997.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/aa6349b0536a43ebb1969488587a7f39/78993086136.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///danimokerigelinijomeb.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/vukopaze.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/nibipanujuxarumexirat.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rbgt6ntk79srlokq9fgd28f5q3/pipaxavik.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/5640424879.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/jamitifopiwugafefulevur.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fetewo.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/tuwefos.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/sufulonoze.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/59724809223.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/gerezebujowexi.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/lobaxaxabupesami.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/43214bfa90c7897ba5ddaa60bb15c949/nevugojupoj.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/f8b48de7eeb03cda18eda9e31486eb5a/bowutiwerewibexowisiz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832c413b33d---lebalefasuxu.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/90070777278.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06b18e44d7---wunoviwox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=el+matadero+5+pdfPDF 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_off0000c929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 10412 bytes
SHA-256: 15a003a4c6218c88571ad7074bb9d66e527d9025a89cf034654ba2dd37944418
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 18540 bytes
SHA-256: 16fdd88029ec02802c1f5492ca80bee450d25b99ae6f0ecc59f3977dbaa97b78

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