Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55028911f36a8f0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 15:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e820231c9414e57441f47ccf8ec7784d SHA-1: a0678662aa7646d3a757a823cb570feaa4cf05da SHA-256: d55028911f36a8f0a07f7816ca84ae67743c78d1eeeae8063b5f0f83ea046923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious or phishing websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://garglob.ru/uplcv?utm_term=popular+shooting+games+for+android PDF link annotation
    • https://doitoutdoorz.com/file/3GDkfFXWpVCQqDzm.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/pibozomamifuriloboxete.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/30676641290.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca6c499c4---pugaxesisa.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/wosofer.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/09tvjpa73raoh0hk47cb3h78t9/73386793876.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397adced48b---19865400466.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/sixatuwalinapupegabovoso.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/vozuledojefogino.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/tibomimo.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/983419018.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/66348864381.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xomigesexovasuwatuf.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/71710340936.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bixetameguverize.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/teboni.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/33291236728.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/ripakutura.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/31513342835.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/56476771715.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/kipivinekarofewutil.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/fagojarejolaxukafupiko.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/takitakifufupoxawavatako.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kobulabodavazozifa.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/51210520321.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/30505021356.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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 11044 bytes
SHA-256: 2869291e929d56100abc30d1acf74a84afecac78dc43fbd7a0c584f35fbb2461
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 17224 bytes
SHA-256: 0efd77b89fbd0df5bd66fdce5d77ad4cd0cbc4b3836d2539dd193fab5382e8a4

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