Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbf700a8610a592…

MALICIOUS

PDF

75.4 KB Created: 2021-07-05 18:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec903c39f82583973e7959d732062c5e SHA-1: fd393f7ebb17b40b4c18cfa5c168137ea0405e98 SHA-256: ddbf700a8610a592ea76288136f162a4e8fc0fa0b4fb174b22fcd2cbabc3b5b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://archism.ru/uplcv?utm_term=elements+symbols+and+valency
    • https://maturana.cl/upload/file/47119175330.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3aae66aae---83669185166.pdf
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/17895595202.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fb3802ca---20269549295.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946f8f03f8c---1230238226.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/85122519184.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04df6e08b---regetomixusikibed.pdf
    • http://eksan-ltd.com/userfiles/file/susunulu.pdf
    • http://constantemail.com/userfiles/file/16234619251653699635.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a70540d1f3c---35976365787.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f62347a6ee46cbdc309832b9ea963f90/pinugolujit.pdf
    • http://zzweien.com/d/files/nuzegolututiz.pdf
    • http://heizler.hu/files/file/47905476083.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jolirusutusuvagubokujim.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/dbg6ol4kcguf8c2ekcvg648933/rirefawewosipiz.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5aaf182e14b1f339bab56ea92ab3326a/fegajaxokosidupavuzida.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094744c32cd8---jerapawubakev.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/64208432381.pdf
    • http://comlark.ru/userfiles/files/welovi.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s9ljsbpsbkf7dnqg1l2pbcdsdn/89479847072.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/eac03709b14392665a714f7f44b0fa7e/21409195575.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c530d8a4b---3921866399.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0952387641305e33ae0f3f3085585ffb/gelujupabilimakowutufebob.pdf
    • http://parkhighclassof60.com/clients/871169/File/26099655048.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e2.bin
8a976f89ef716970b4617d8a240d5206c483570dd44cad23e406bb654713d575
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 10644 bytes
font_01_sfnt_off0000dd4c.bin
3d70da4d9964fd939075c757025fdd7f27ac34f792787e0d98c7c38b45a269bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 16552 bytes
font_02_sfnt_off00010860.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes