Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8531b1d64cf62f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 11:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 589074065794d97acfcfc6ed13fea45c SHA-1: ebe7189551cdfe9b1c34c58091b70bc4593e13e3 SHA-256: ed8531b1d64cf62fb23b4a5beb853f0db4865f74e16deea2c965a7776a8e8a05
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0e8d14f93dc0167776b776a6cf429f46/92593673434.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29d824589---70641430547.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/bebabezurijison.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/zuzabi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24cfc9e10---sojusisawuf.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/84283976647.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/fefewisuvekulonuvufoda.pdfIn PDF document text
    • https://datawire.gr/files/files/39283067160.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607290cf15c51---35346729956.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a20509fb2da25849150a08cfede1fb78/36630248103.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/36835611144.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a10cef89---97495845099.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/71596727428.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210902233538.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f8a425d5---purebivusag.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/jorag.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17efc3f95d---fawumexumuzitaki.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99609745f3---73299030992.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/64249160567.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4a6994bf84927f4b174596c41efb9e6f/xoruka.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091585979c0c---fopifugaz.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/famosonojiwobu.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/jafizenekufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cara+penulisan+daftar+pustaka+yang+benar+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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16968 bytes
SHA-256: 70f682b0c0de9ef3b27f1a481e10ae391e42c90e52844690fc802d5f1f69c7c6
font_02_sfnt_off0001215b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215B 11028 bytes
SHA-256: 588092da164a0eb08070ed12de1c062c3654a1767d6486f36005e21a35e9db25

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