Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fdba1218683c99…

MALICIOUS

PDF

86.7 KB Created: 2021-07-23 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c38195aebf455ebe043bf9ede856ca95 SHA-1: aac11379be82262155731adea23d505b45b2cff8 SHA-256: 81fdba1218683c9968c0bc3194093db79bfaa0758b48c4bfb5b6563c3a8245ab
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, including links to compromised CMS upload storage and disposable hosting. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a malicious file. ClamAV detection and ML classification confirm the malicious nature of the sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9445f0d0ef---xizanotexe.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gcre4l848gs781oc43ijee59rr/jerogajamutiguralotagitax.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bki7kkvggoa4672m5i03j8vdq0/jawadedukojuni.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe9e50367---69741383450.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/75oc3b4nbnruvg9cjke1godc91/kutezunikanememunuzume.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051410502362.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-16/20210616144921313019.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nao21gk66spimjj3qjdi3okj91/48899140055.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/figukanojok.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/potirepodogupetimisov.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/2118400052.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/siniwalutedekagalikosowur.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcb170d95b---75524315639.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2h3b0smgajom46rf79mdpdim5/velumefajizuzu.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/93053186023.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bf71c660---kivufopiwimedifun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3138c8282---25408732125.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3bfe00fc5---55446599014.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/5ua6edjqauh4p79a1mrqdcatsu/zorigero.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xuwov.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4812c7ee---fevofiwa.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/miratulonibolixofi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/sulagamozikuwulunuduz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3d61794d---83629984997.pdfIn PDF document text
    • http://ezibra.pl/upload//file/51210233862.pdfIn PDF document text
    • http://blueyee.com/upload/file/280820526211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+get+revit+for+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_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 10192 bytes
SHA-256: 241f9b94b64ebac48f96989d0e1f125a2e068bad1683c267ae23527661d3b5ba
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 17516 bytes
SHA-256: ec8291d2b4cb0e7837a1fc0909b0d1d1dd617b07740c5517b6b6b7a351f08a31
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1