Malicious PDF — malware analysis report

Static analysis result for SHA-256 77eefd8fe67f2c80…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 03:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 491655efb2394bee072713ccf5dfc56f SHA-1: 03e2218cecd6ae496285906cb1e98ea60913c951 SHA-256: 77eefd8fe67f2c8049b0dac2f46643d52f0e6c551e09c0c7fb2fa6d562edca94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm or redirection scheme. While no executable scripts were found, the presence of these links suggests an attempt to lure users to malicious or phishing content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750f798c344---9325260244.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1e297ced4---koxini.pdfIn PDF document text
    • http://recrute.fr/files/files/vuzomadalelaruxesa.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/317bd979cbdd92b58c2ab109ec8d122b/16659546027.pdfIn PDF document text
    • http://chineseclothingonline.net/File/fakulile.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c53955d9c08---tawusuwer.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/gazemaxedorujixajodip.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1onfiisnj65m72ossckrggima5/18822764926.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c79bed863a---91022064840.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105180912.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b0c0598e---femaragizadafaz.pdfIn PDF document text
    • http://policylic.com/uploads/files/63471880332.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/58023407165.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h2m9mnuekgn7fmqo0cmk0rlk9a/xerifobilumufaronopufos.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/64516278373.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/51528572155.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1886981d52---fometimujafiraweligedivo.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/50312461345.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sqte97nam9cfos6qqfbdhjrr22/zopugusebedoresuzusi.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/wawaluresojeromegop.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098863e4b0b1---20931037750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=4cyl+dirt+track+cars+for+salePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 17260 bytes
SHA-256: 655f7ebf5a52b60c945017797b75158a34a2f65643c53b19b56ac3bc92464b64
font_01_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E8 10552 bytes
SHA-256: e77c30678d4184f2a21388bc08426f8ebe9806982b6e6c8db3b98256a83b3b83

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