Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d150bae36c89739…

MALICIOUS

PDF

77.9 KB Created: 2021-09-10 07:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 998ab74fdece57f30700e2b7ab79e926 SHA-1: 4c46fc4e78841edc1cda7c3269af0b9f5b3e137b SHA-256: 6d150bae36c897396beb43c97039f3a25742c4d35cb05b9f051fe0e3193a7b1d
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 0.9943

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 http://willbramephotography.com/64398433742.pdf In PDF document text
    • http://canhtoanland.com/upload/files/fodavexajovon.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369a3b312b8---vatuzakamabeta.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9878d0d917ce6bba9a1b1deefdd2ca17/73272203872.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/sunodaje.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/mefoviju.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/2796205067.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/60865706862.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kkjg9bj2dmu3d9h0savq3foftn/88272691790.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/53682887548.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/ruluwefejoragadizoxomewu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bc555bbad---xeguladixosesolikapasis.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624a5e3677---77851238192.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/66210119645.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/68305916742.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/nivibexeridabezujarif.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130451b0849c---fonivimowimuxizafumod.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/71557388618.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tasapexadebifarifo.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/rupax.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132efbf11b7c---mumap.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/18637657079.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/10355992410.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/21315843337.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/zarugodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+keyboard+app+reviewsPDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 17560 bytes
SHA-256: 9f0a09dee3943d66542aa287f8845ffb9e098080e22bfc4f9a5fbf6c8921991c
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 10720 bytes
SHA-256: fa49eb2174fc3aeab2980d121e34340a4c14b9816398695233dc98f9b4d19642
font_02_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1