Malicious PDF — malware analysis report

Static analysis result for SHA-256 afcd4ecefa4d667a…

MALICIOUS

PDF

82.8 KB Created: 2021-08-27 03:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dc7afc6a390c966588d216ab297bf920 SHA-1: ddaa24aaa2eb602fe3b3d601fd39dabe2c710aee SHA-256: afcd4ecefa4d667aea83505657b6367f9698b6179032a003e092b55ff6cc9b02
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by an ML classifier and contains a link farm pointing to multiple compromised WordPress upload directories. The heuristics indicate that the PDF is designed to redirect users to these compromised sites, likely to deliver further malicious payloads or conduct phishing attacks. The presence of numerous distinct hosts and links suggests a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116c15e1f415---82078295496.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607630cd4cd1f---50463995266.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/32560297035.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/f0kvj8dh8e3vbjl5jvmfh20t91/77624672767.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/palimufajegor.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/sarogobisazukima.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021613811548775.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/menolonefowaruwimukuv.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1dacb8b31f25bb930e4a8db3ec586bf3/xumezovonixulidezo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/gijaruzedizeve.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9i411k2t78dal8lh9siq00vp95/fofikomivamunotepafen.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/losesifuxabuzuti.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a341df51d4c---dadezinop.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/86391482097.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/pusuluxujena.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/nasigamabosorotitafekuga.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/61565997380.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1611731d141192---budigovonosino.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bba9c41f6e7---86484350376.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/3023015666.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a0dde702---44547079027.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/depikaxajisefogilopupuro.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/23044664639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=valentines+day+images+freePDF 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 10660 bytes
SHA-256: 67c4276afc71b235cafa9187ae403bc0f5f662a77cb5009f501854f3333c4d1e
font_01_sfnt_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 17920 bytes
SHA-256: a2669b50658d5b675bab65fbefd8e86698c9823b55436db83b5a597c6d0804c8
font_02_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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