Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb0a5d8eb41a80a…

MALICIOUS

PDF

95.9 KB Created: 2021-07-07 14:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: e737c65aec4e4e0444a0fa28b9852b4d SHA-1: c75dcd61a468590b77c24fddfcc220ab09c4aec0 SHA-256: 2cb0a5d8eb41a80a3fc5396677828db39deeefe8d3b43b93a5ae6228122acb01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://inwebjor.ru/uplcv?utm_term=free+code+source+android+reskin PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a3575b1e67b9abc6d61b89334fb43b1/64973507819.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/29586473780.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/1e21398e40d84000270b629156ea98dd/lifikapanorad.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f26cb416fc---32197138097.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062716205420.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/nazivodiletuxaraje.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c8d1f6a2---92443868789.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7d3593fa7---1661541021.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/bakurosoz.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9d9252c7a---69644947534.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/72599636960.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/39370f91b50a7f3eec61f39ec03a9e7d/vuwunife.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/98326106453.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/5814291232.pdfIn PDF document text
    • https://europartner2.pl/uploads/tinoxijujujir.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c136e24b0e6---46598996190.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/25271377300.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/fifuvezobajonopazasunan.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0qgnl0a0vfitad45luf2vlk036/80190717003.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a7d67369b3c28618d46b8e1dad44566b/94985354805.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/77393233506.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/55831887769.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zonepi.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/m8o4pcgu6kgggsipgt20l6ioc7/voboluzewaworipa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000103ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103AE 21736 bytes
SHA-256: d3ff97f1c75da2df6320e08dc2dfe5e26735b4fa8ff5ea08dfdf2f195b21889b
font_00_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 17948 bytes
SHA-256: 74edec269c8db2f8998ee1afda68d21d514c52b8f5049a9ce87905f9ad455e62
font_03_sfnt_off00015801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15801 10388 bytes
SHA-256: 9e2aa594a6cf16b1ae6fbd720780d85316041d70e9201c068bbcce955fea9597

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