Malicious PDF — malware analysis report

Static analysis result for SHA-256 645ce70792ea7c32…

MALICIOUS

PDF

84.3 KB Created: 2021-06-27 11:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: feeee0fbc74a7e0e253b6e468179b86b SHA-1: 2224dcdd683d2038be8e03c7859983b4c494657c SHA-256: 645ce70792ea7c32af3d151aead6166463983d6785f90b5bfb286e33c78efff1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.aportecnica.com/imagenes/editor/file/vojuboxuridalekitopel.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/62b5b77065bc08a8ce102ae6ff3cff93/58478167536.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac223c5089---72699231545.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d069jfgoofjscr8makuef9cbu4/1494997244.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/c4deef95f09732ef0a17c47329a0d909/mubiwunerakijula.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609834b570ef5---74643457594.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607268e36fc98---ritojabiverot.pdf
    • http://sotel-perm.ru/site/file/48745516469.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160772f87a2b4a---najuwavazefu.pdf
    • http://aisef.org/uploads/userfiles/file/file/kojitososo.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c28a8dd0f91dc62532472dcfda40e32d/73717879182.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738011be2f7---wikitugop.pdf
    • https://solener.info/ckfinder/userfiles/files/94564844554.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16074425e0c1b8---zolelinosiz.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b1e76bab7---soxivakebafuwu.pdf
    • https://mimpishio2bet.com/contents//files/rotixivajit.pdf
    • http://austral-immo.com/userfiles/files/bovabazisaxutifuruxuro.pdf
    • http://whatdwellswithin.com/file/ramizotagikazo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2af6695529---98305006410.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4b1913d98ba69a486eeabe650d17eac8/sutomedewedabizer.pdf
    • https://universal4shipping.net/userfiles/file/fozoniwasigum.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/notksrpa1auhgp2u4afh8ad7rj/kulorokojexawurupego.pdf
    • http://shinies.ru/img/lib/file/8915369385.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/58935cc3633ba99d6191e9d06cbcf771/44209481705.pdf
    • http://x-site.by/upload/editor/files/34905578847.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=delete+pages+on+pdf+online
    • 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_off0000db4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 16792 bytes
font_01_sfnt_off0000f35c.bin
5141ca97ba7a76c8d59832c30ee0595eacb1d6401bf36f3eb3fcdd237ea88c58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 26612 bytes
font_02_sfnt_off00012baa.bin
700c0a7a824ab911f8d380ddcc68d2f7f2c9b9f4a54ae04a237ea7a18859f23a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10572 bytes