Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ebb633b8d0c8b6…

MALICIOUS

PDF

98.8 KB Created: 2021-06-28 22:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 74cf77806dae8779278e37a8821baa27 SHA-1: 5d4c8f2db997d091a260b09a000344046b7a2d6c SHA-256: 26ebb633b8d0c8b63737b0ede8cbf01ad4fe87fc4706f222e6c80acbfcca4425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5cb45cea---47747766635.pdf In PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/18888004040.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/1af121f411b28bd266c03c5069687825.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6g8le46001bsud2j0godv1vi71/paxezixezezovit.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67458952f6f0feaff9f72ddce5137350/zipelad.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/furokuwonugavugum.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f1887ee1---giraka.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160969aa71acd7---15885225629.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/96921513155.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a8a69abbc---punutolifufuxa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be59ede8d---sikarobab.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096e0e880de0---85980987981.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ad163778ce6bf85511df95921f0745df/genodawafivusizi.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/wivekibetajirokojetizete.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f33992ad3---sawujor.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c99116s8hp321u5q7r12di2mn3/mamofasopiwepiledip.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/42755639355.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b86c57440---tifofuzuza.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/natuwuxirixime.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3570nscisja9h753bde9653a5e/balulaf.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210619065308_1818032051.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d37efe0559f171140e1fdcaebbaeab3e/57118389339.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/34365999609.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/19161141364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+unthinkable+thoughts+of+jacob+green+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 16060 bytes
SHA-256: 79f27ef1bf85ca6c198d098614f2f622ee7798d500390a76c2468bf998b64bfe
font_01_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 11324 bytes
SHA-256: 307f5bbf3822a644307f652b028872bbbe15791a32ef647abfc8e6c62104c0b8
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4D 17988 bytes
SHA-256: 6d43972240c60895059a1e0b3e374db9592497a56b0f6f4e7370bf164b34a3c8

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