Malicious PDF — malware analysis report

Static analysis result for SHA-256 96035aa8c95dbd2e…

MALICIOUS

PDF

89.6 KB Created: 2021-09-07 04:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d7b1116da45214281a748873f3422467 SHA-1: cf7bd24b96e7c917c7ff4fc8c74fa01bc652f142 SHA-256: 96035aa8c95dbd2ea3b3f3f9c07ad9642cc84d1e2f9f489908e3d1a4fe4f552a
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=sextant+manual+pdf PDF link annotation
    • https://baohohoanglong.com/userfiles/file/15814845388.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/11320024991.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/71540259557.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/30794075800.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796849d95c2---bomafo.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/58395599565.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/xovebotirubobiroxuvixagir.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebba698e02---zojedit.pdfIn PDF document text
    • https://agatanorek.com/files/file/xefemirojepogoboborobir.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e687c984cd---15392039233.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/zaxoloxotu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/90k1v1jjjhnuhiq5gcnhe92ro1/94558293494.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0dcfc51adc1fbfe3e3b63135d361853e/zepovuzediw.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbee31c7ff---92624069347.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/mebawexaxabogudusurov.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bed7aab47---84792464750.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb47ee252---47152445348.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/wozevogozapumamemubupuko.pdfIn PDF document text
    • https://medtek.vn/storage/file/xepizanimidizewobiguderax.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/6895163150.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2c03f3785ce222326985193d64369a5d/32820171928.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/86063524709.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/12850873329.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/908181aa2ffd4ac4cb66ae7b16b62d71/sefixagabexigawopexipewa.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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 18252 bytes
SHA-256: c0b5f1f1a2ac50ef20d2ab2b749d9b360b0faa7c11a0fe345a7bf199bd82467a
font_01_sfnt_off000128c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C1 10456 bytes
SHA-256: b9a08deb02186951d174a4d59d0165aacede1d771eb9ade26f781abae36e2bb7
font_02_sfnt_off00014089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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