Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bcd4bf24ff33f3…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 01:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01caed444c37eab8035226b30182596b SHA-1: 1a2c2be9c4f1cddd8c4cdaac40aa116949ec559c SHA-256: c1bcd4bf24ff33f37dc31d86f82736febc84e6520916a61ecaf85bc21d2ba323
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'minecraft pocket edition' search term in one URL indicates a potential lure for users seeking software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://ww150006.linebot.net/upfile/files/20210920042415.pdf In PDF document text
    • http://cartopack.be/Images/file/gokanapobaj.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/5884577127.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/milabuzenekegisasere.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/36269793420.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/pokojuxewake.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/wikulurufuvavixarev.pdfIn PDF document text
    • http://marymo.ru/uploads/files/xudidusitesirajarulabuj.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/1105779667.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b813k9mgls9qrnkt558njc4dd4/51230622233.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/89a84e61cee56d23a373adce85702c99/zufeketizexugawemefav.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143b292eb4fa---59527602198.pdfIn PDF document text
    • http://emannsltd.com/userfiles/kulusali.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0a02ca0f---dixasi.pdfIn PDF document text
    • http://c-six.it/userfiles/files/mepojekejiwifo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcedffa37fe70497214d5f386a2cb88f/fegobekaguzudodap.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/5483731747.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4ca577f8e2b6812c4c09df40d1ec6510/79914783876.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/98674289141.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/midemuwi.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/lazolos.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/kopilibokoxojaz.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/toburesemizebitonika.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/29409943416.pdfIn PDF document text
    • http://trubaopt.ru/content/file/55708480974.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bef4d32251---52895469592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+pocket+edition+latest+version+download+for+freePDF 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_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 10848 bytes
SHA-256: 45c61a6adf2875fec701e022828272b7f1a0f8e57b8a6dec5ef35a6f6983d334
font_02_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 17636 bytes
SHA-256: 740d190ee951c837ff8497d87a041e82cf6aa57ede6f49bdb821794091dc97e9