Malicious PDF — malware analysis report

Static analysis result for SHA-256 01dba1ec8dfcc390…

MALICIOUS

PDF

90.8 KB Created: 2021-07-20 12:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adffe98409e9e908565d8f8afe00147b SHA-1: ec29f4da007ae39556b3d1fa17f226013a615610 SHA-256: 01dba1ec8dfcc3903bf67ae3ce4cf52a9194d4355c7b5b6bf7819faa8a95f54b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content, potentially leading to the execution of exploits or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e72e4679---xawibuxuxekozedumifemetif.pdf In PDF document text
    • http://parentini.it/userfiles/files/52927295328.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/luzekozizamoguri.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6fc86faa9c604b710c3f4a5d71fb4bea/91583191042.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608684153e12d---wugerovugudadowitaxex.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vrs7st7gs5r30i3ffdp7m0t7al/rabafebemutuzadeb.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/v97c0bjqk6gno78hv91jo5724g/78936188404.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/xulavopazosufokuxote.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee5914c19---74220568537.pdfIn PDF document text
    • https://rajaunited.com/contents//files/zivopa.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/56c1df2cc28c289ed7e96737bbfcebdd/befoxob.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/90562560744.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/77868323800.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7646316308---89308098120.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/dawotixewiwexaren.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vodetivegajimofuwolazeb.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/lowafugaxanonixawasokidu.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/kitotodafozagavujojurara.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/958911dda97c80c1bd68ab4ff5e0f536/70976069059.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95476178048.pdfIn PDF document text
    • http://technocom.pl/editor/file/9479023512.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083b32d1233e---barotajezerilo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c227de44c4b---83470772450.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54243b9f9---19464580351.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/75425636053.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/128a1add48b5d6217bc1141af1fed9c9/15828926341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ill+content+definitionPDF 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_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 9992 bytes
SHA-256: d40f4e8c2ff878edf3b5bf6ea781e2e903f4875f17d925105ebd660504805ddb
font_01_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 17548 bytes
SHA-256: dbcb09adf00fcec7f4865c786680be6ccc35032c8237ae7e3e7102d55112880d
font_02_sfnt_off000145c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1