Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7aa32974c1e2501…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 16:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff163f6ea5e61f6340e9778da25bb77a SHA-1: 3adba3f405dae6805c720285457aa1ac48bb88c8 SHA-256: f7aa32974c1e25011e42ff93255333cc978b79e32c678834ac4ecbc2683f2d5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://ketchas.ru/uplcv?utm_term=hp+probook+450+g6+notebook+pc+manual PDF link annotation
    • http://aceonlinementors.com/userfiles/file/95187331759.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/31520332132.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161277650a784b---piloverexulofatoki.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160801af245987---66947346597.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f41ee223ac95993d5ca8159248a985d2/87237785027.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/xilivejivinej.pdfIn PDF document text
    • http://modern-pro.ru/files/file/kimojeki.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/76129078607.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gupozasujimizif.pdfIn PDF document text
    • http://laduses.nl/image/file/47973592592.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/kogixukugunikakisop.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/91841809538.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/93935649581.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160927aee72a44---niririrogesunez.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d05116bb7e2af9940bb600a363249749/61633786742.pdfIn PDF document text
    • https://ancoraeducacion.com/images/lodosabomudaginojorolepa.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/35acdf434aa5c2cafaacdce785d2a2ac/3188144900.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0483340b2---39058547713.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/vafiwowutatakozesijodud.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/xatakigejexikunitefofa.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/bepuvoxudalasi.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/ralopok.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/jojujor.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_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 19632 bytes
SHA-256: 1d698287602a7a9a76438c5de8226f357c2f65a1ae72895e37358b3ea0061bc4
font_02_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 11280 bytes
SHA-256: eeab3978f71f6972d43028d7caced3ea35634751e540a2fcae4055e9b474551d

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