Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc366e60f864c5e3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 10:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39797a0260e7a50a471c5a7b37595dd9 SHA-1: e7c21aa2ec7633b0b679c6745ea57281a65de8bc SHA-256: bc366e60f864c5e37060048c5e668d25970c3fb9d6d78e3770802fbdaaeba0e4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous PDF files hosted on various domains, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted from this sample.

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://ybshajiang.com/userfiles/file/2021-09-12/210912223415661489w5ealureuh9c.pdf In PDF document text
    • http://christ-china.com/filespath/files/20210910182152.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/82517752182.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/21740145537.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/a6d1cd.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/956e9229d7bafb78859c93717612426b/43042096457.pdfIn PDF document text
    • http://geoman.cz/data/file/tugosesozavi.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/74618739685.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/15a2c7132f3f017894979654e4d45859/lapigiwiluxuredogope.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/53566230723.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/60125452334.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/wazewidomuv.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/morodekunesilelo.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/vixamuwadetana.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jasajufisamomumoteve.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/80271835972.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/94024893532.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9622352---86497237313.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/26592540570.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/190506468.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/dofumevopitasejalab.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eee2c585c3---85498258229.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/mapufagukosakiligivale.pdfIn PDF document text
    • http://matras-devison.com/upload/file/42841010832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gmail+di+androidPDF 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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10048 bytes
SHA-256: 3921f4f2777399522cc321bde72ab4be06697a6fc234d248502db9fe1cec7e6e
font_02_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 18168 bytes
SHA-256: fc43553ae185448fa6df1d8b9165cce1b64160ba8dea3150c035ee951356a6a4

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