Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fec6a7ffaa3da1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 00:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85c33438879e64763f21ebc1d34fa02f SHA-1: 3e5b0f2d109764438cd840eccf806b44eed13016 SHA-256: c3fec6a7ffaa3da16949f29a8458cbbaec6a27261ef2a49264ffb4a19b1906d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL patterns suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://kartelabasligi.com/images_upload/files/sefuberetis.pdf In PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/gonotitobabow.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4594f08f7---65169104320.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/laxaludagewawuliw.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/rosetedopalupat.pdfIn PDF document text
    • https://ancoraeducacion.com/images/galomafudobukumafoz.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/sowevujukagikuw.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/4690034512.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/26479898159.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/zalonaroluremudefadofota.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s7mq9677sfco9jr0io9c5fsj21/lotobejuzikunetami.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210905074617.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/fomudikapegubuwowida.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/wusaxapukaveninewileg.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/51377200981.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/87277293691.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/97990784824.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb1179b19---30427691042.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/43474737262.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gr92jg76ahrga8570gfa12i9l5/dadomepepuwefe.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/19315677703.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/11753133570.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/stlqf0ngcchdln8qma9b7mug24/xulinazapovatogibozogole.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc4c4c4e4---sezerigitom.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/15626446109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=christmas+photo+booth+props+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_off0000cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6C 18000 bytes
SHA-256: ebfdd35c0d349421f6e6e273c0c8d2d22b98b3cd0de5299eb9366ec44d7a7517
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10652 bytes
SHA-256: 79e7ca1d744de1a7254e018dec076db010fbec672f284307426725f9bda37e4d

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