Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c03743e27a92955…

MALICIOUS

PDF

100.4 KB Created: 2021-09-06 05:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c0a1392976b1f7897bd4c5f48113823 SHA-1: ff762d4f5da2e761ba286f0c62a51780d5cb43f3 SHA-256: 5c03743e27a929550ef623adbefbd1df42436fbf9e8aecc3d4166ee7839b9ca0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=bestandteile+eines+computers+pdf PDF link annotation
    • http://anjilh.com/uploadfile/file///2021042918035939.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dewuriku.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/31003218136.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xesonotumevatalobopotep.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xafesodumejesuba.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160855fe529448---lipotilexidiragunivetusu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607742755073f---70952307528.pdfIn PDF document text
    • https://euchebnici.com/img/file/sibupatoj.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbc405ca0---rolojifaveti.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7bad9d852---11650934058.pdfIn PDF document text
    • http://sjanzee.nl/file/gukegunutugafed.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/havq8p1uc1suf6ggs8actsgvi1/setejovobuzufekute.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/filolevixarisasar.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kabuvamibujejejutunoxaka.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/47876203034.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737686bdeab---68790161571.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c94a71807c---vedapasuvetuxoxif.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ljgn59dpufig5teeoi4s3bmh1f/soworetudufalidimumusoxuv.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109041356124870.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/97385771460.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/tilasaginotubabe.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda416338f---96723721395.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/kasiwogejurejiwen.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/95011984821.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9438405f2b19c6ef1007e9f58c6d9aa9/wibujinorek.pdfIn PDF document text
    • 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_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 10936 bytes
SHA-256: 61dc55c0da3409a2cb3e5862fab25084dfcc55343229a31666b6bb0056586adf
font_01_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 22328 bytes
SHA-256: c255a9dd5c8dba69e4a9bd7bde86a28eed96b3813d4170a01794a3f4e5fe2a06
font_02_sfnt_off00016b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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