Malicious PDF — malware analysis report

Static analysis result for SHA-256 02567588d79956a9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-06 17:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94d0b053fa65af6d2553acacac7f8359 SHA-1: 8dd65805274d859a94455d811acd21704fee53f4 SHA-256: 02567588d79956a9c958e7c454b7add36288da0a5a10881c3bc834b3b1b8bec0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm used for SEO manipulation or phishing. The embedded URLs and the overall structure suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://k12kos.com/ckfinder/userfiles/files/bejigesipaf.pdf In PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/415bed2e3c2d185c4312ce92e4874cad/69092067715.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/54019741015.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/003134e7d136eaf0cdf16e5b3a49a1f9/59698447305.pdfIn PDF document text
    • https://numberonerevolution.it/file/9983688867.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210609195753549114evs99.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/popukabadiludibewanofibeb.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/29213899377.pdfIn PDF document text
    • http://muszempilla.com/files/file/49179354555.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14830fec9---54187610275.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/23586610800.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/jubimafovufig.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ftigjo14uu8c83m4jt27dmu2ke/78815308677.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c62aeb1ffc---9208920464.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2968h7ahj58e0cr9r4cma357v5/kifumevejawivusejibiweze.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607269f5c43a7---84722775371.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/nedutividerixo.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609830928b3e9---10660421298.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/51f16116c01841a2e4653ec9908ccdd2/nevajasejulaximimir.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/55d701bb58c58128e1ee79f769e9f4e6/judirirabumugasukafonixa.pdfIn PDF document text
    • https://zhansq.cn/upload/file/48709889010.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d87c546a31---11511568978.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/ruxosixugamumevowonirevoz.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/23336489598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=shoulder+exercises+bicep+tendonitis+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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 17248 bytes
SHA-256: 10cdec876c63ad90bb25ab31b8d6068f918bd02b729e69795d3aca3484c8df74
font_01_sfnt_off00011482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 10972 bytes
SHA-256: afaced0a83d8199ec26d55d2a4b95d53a64a9a556470ff3f49047c3573d99a71

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