Malicious PDF — malware analysis report

Static analysis result for SHA-256 6410989e9b2b8cc0…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 03:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7663f819a4175b671874aba318fd4d41 SHA-1: 577d493dcc9b1c6408f2d7ecc1503b2b8d5e2799 SHA-256: 6410989e9b2b8cc08d4dde3660894e715fdac9b1190c06201d54391834aae217
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites, facilitating phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://outspokenholland.com/userfiles/fckFile/20210531050936.pdf In PDF document text
    • http://alptw.com/images/files/wigexezisixivowav.pdfIn PDF document text
    • https://argumentua.com/i/file/kurixozobuwasubeberisa.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/64392731074.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/98462267171.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a407c0ff3c---14807840907.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b452109a7eabb963e379d4f559ff5325/68528121998.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/7982651565.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/78928457266.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/demix.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a73ec2904---xemazagasijuza.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873f100d72---21809048221.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8becd35e8b---giwejotexakoverali.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/52006943646.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/zedobibivakibowa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zomorunurizelavitefawed.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/86818364823.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c85ad6bba---49928265695.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/92057280172.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2c629bf04909417bfb10a0b32409a6f/kejutume.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/luvabogo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffdafb29ec58210b595d1595a5d2c96a/wuvesisawujekanugadel.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/55487779712.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64eba3c499---likiko.pdfIn PDF document text
    • http://marketingnews.fr/images/file/tozabiketaronusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=happy+valentines+day+images+for+friendsPDF 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_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 17204 bytes
SHA-256: 139ffa1ad9a190b6251c793ac649db17c084934323c977431f6d4b0d04f5781b
font_02_sfnt_off00010e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E90 11012 bytes
SHA-256: ffc2f78e947bfa9bfb229f3a4a354f4debd63f17da1dd37c0ee1ebb770a6cddc

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