Malicious PDF — malware analysis report

Static analysis result for SHA-256 0543361b845f9d11…

MALICIOUS

PDF

115.8 KB Created: 2021-07-30 15:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e92891715d48c2f409fcd8224363859f SHA-1: 46657a97f1837067d2dd33caf590631d19566ddc SHA-256: 0543361b845f9d11400a5eb169c688791857ec5f09be7d7d9a1da77e7b3dea59
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23dba31a2---duzonodina.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tgnp2kjklu21pkm5ji9m9bemst/sixuwosimezepajotoj.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mejemifetok.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/80705379777.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kapekeb.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6bc395c4a---totekezebuv.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6b7fa9d1f---69817387356.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ec9ef8bb---janixinevebalogujesabi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19104c776a---56492699814.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4a30675fd---5360740755.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9798abb1---jipepopixupizelu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/11eb44b1315446452b5f9ccd45440e94/zuzonagisexifebaku.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/91v4up1in2c6dvdal4d9el3js0/44920057229.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/55942387712.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f490210aff---60733553550.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3491e840dc7e6e57707f699162bb6a2f/62806941483.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/94201658257.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ec4a1gnqr522jmikcubgpjsib2/23890365974.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kugaripifixofugeruwo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7344476eed0361477e8a25f6c9cbba7e/dajitoxududedozeputesa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b313e9bf737---89300647173.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5df7b4342b---kamuturamobafinijixowez.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/robovewaxuv.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/37553705403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lemony+snicket%27s+a+series+of+unfortunate+events+books+amazonPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdc37ef18---xutag.pdfIn PDF document text
    • 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_off00015f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F12 11012 bytes
SHA-256: 4d74e3e585d98175623e61cca0be6de1427dd52f729c3f28144ec63c0dd89950
font_01_sfnt_off000178d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190EA 17860 bytes
SHA-256: 5f5f566a7c1d8d8b4adb74f963a7a47f9d0ae683d6d4b42fae706c1f300b9824