Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd746d4111bc8599…

MALICIOUS

PDF

87.6 KB Created: 2021-07-08 09:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2530f55bf988680ded2c617bd615f206 SHA-1: 4d9c24092556024d237873378af3dff015c1fadd SHA-256: dd746d4111bc85994a97b80a515e7cafc72f1d0885b5eaba0661e9de7c9849de
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/eb8830604c802a43383dfa1d99c2bce4/38486277720.pdf
    • https://m3csrl.com/file/74448451454.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad91e04d3---dalesaziferizu.pdf
    • http://personnelstrategies.net/userfiles/file/matavufunokasota.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098332eec1c1---pipapolawalasenisudedaki.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/i92mcric78dtdhgpushjks1os3/tekebilegulogalivut.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/cee054c67f071dfe774768899ade757a/91494600384.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/g20q0hllvo2fs0bf1dub1l6bl9/59428905653.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/e4dd8f6ff1579c9ee113b7228358dee8/80763669656.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd3a7bf8e---89726033764.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/37981876255.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/b0vrbgc9iu15ho1afq42sheh0g/xukebirom.pdf
    • https://bataretak.com/img/files/file/zetizaxarokukefe.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3adb10579f---rolaxupunese.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2c12877efdf757c832fa7924aead1b50/25096228782.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vg7qesn869tko8uaoqv4t6c8q8/pobifutefijomoviwunikij.pdf
    • http://velocimapper.com//webfiles/file/61515557535.pdf
    • http://notarbrazda.cz/userfiles/file/tipafilo.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3d0dc73e---nujenolifudezo.pdf
    • https://securitydm.com/slicice/file/54867683582.pdf
    • https://susta.vn/userfiles/file/notad.pdf
    • http://jnnycc.org/userfiles/file/fubisavuxes.pdf
    • https://777mto.com/contents//files/nusovovewevod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=automated+snow+removal
    • 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_off0000f534.bin
ece4bfa4d31d2df5d9dafc49bce74151785e1fec25d5cc527d52abc6c670ab9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 10552 bytes
font_01_sfnt_off00010d5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16792 bytes
font_02_sfnt_off00012570.bin
163f7510f7c4c90d3e625eac183635c50eef57d86b57e49dae19b2184f137cdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12570 16856 bytes