Malicious PDF — malware analysis report

Static analysis result for SHA-256 7904dcbf1aaa91c3…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3fcad0e3908ac7e7b840e263ed669cd9 SHA-1: 6e00d49342d95e238692a97c1e5699fd44b17a29 SHA-256: 7904dcbf1aaa91c3c620b182fa7a44e133cc95949ffcb9b5669d6bf83940671e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=colon+punctuation+meaning PDF link annotation
    • http://historia-bfured.hu/userfiles/file/fedigenuzadotunuxa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9t2vdkdikq08prljkhrcblh13r/78683213832.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/varapajixikubonipegu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/fepesagavanunakirufu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/icttt811eo8f9rhstir0re83ai/desidax.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/66092239817.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/700aff6e6ac1b18935674a90577bc9ef/wativede.pdfIn PDF document text
    • http://askort.pl/Upload/file/tojujaru.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jepogusowababud.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/feduv.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8358d513c---39437434542.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/19624074322.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d32301756821dec39c0a5537ad795a38/xitikajivomobi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1cbac1ca63fdcb9d0e399388b0bd802c/12681278056.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094cecaa3129---tiralirofoxosoruk.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/e7hcmi8e2922gfscfimcp7tl50/91280686389.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e2d6f2fa---nepabetobux.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/846d5490d2d219aa1648f17a12868624/duzapizavadodakati.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/23ded76af5c64005495fb846eb11a2dc/24840016873.pdfIn PDF document text
    • http://lukinserv.hu/file/zoxevokufulufonutet.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/gebagavazonokomap.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/pugenijewewugotopanuvo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/5122617810.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/38696690762.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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 10580 bytes
SHA-256: da688be8f38ec178470664bbad27d1a205ddccb33533bbfb978eeed726a8ac21
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 17036 bytes
SHA-256: 9d2b626d09d6e1fc02dd29efc00361547385137792120583d4ff7c7e915fb5c3
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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