Malicious PDF — malware analysis report

Static analysis result for SHA-256 081a2d36e1ee8612…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 04:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 3b7e4383342e0d37036ac1dfbae99008 SHA-1: 2aaed46d74b7bdf3cb180c38eefa49d1b27fa59e SHA-256: 081a2d36e1ee8612ae31fa15f302b0f2403f5c3b0b48db1aaac187b3be309652
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan threat. The structure suggests it's designed as a link farm to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ceccarbotosani.ro/userfiles/file/rusutiketolavapu.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425f219952---48024679820.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f2e9975d02d6ccc0c193f433da0cb950/44243756086.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160872f12efacc---zapanarizivanir.pdfIn PDF document text
    • http://emannsltd.com/userfiles/4289490212.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/15447004988.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/kepaxixapoxawevana.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca063a8beb756e3844581453d2910432/19792674689.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e2777b9f66ced28784c547d698c9efdf/60292179996.pdfIn PDF document text
    • http://prmakeup.com/Image/files/27391231301.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a7e19291b4c53f4e2493687439f7c950/66808439711.pdfIn PDF document text
    • http://hasyo.net/files/file/94466503473.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b3769f069af772195cc5ba480e54e611/japezatofivuwove.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/97148380528.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/1995127455.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ecabb3658---rulaxekomefamepenonexari.pdfIn PDF document text
    • http://inercial.es/uploads/files/37765806599.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/keranavamubepuni.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160fa73e67f5ce---88591923186.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3e49aad84a40f5cd340b58433292c40e/94228476242.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/97313180229.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/panokaz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ffaae85b57df78f9f11ad749f4344a57/75676422613.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44f9af24e---nafalakisudaleg.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lokopor.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/48916456750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apex+answers+for+chemistryPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17840 bytes
SHA-256: 7795b0f48a979b9e06f3ffd4172dfc881dcca632ce225c781ae21a0f814bf413
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10980 bytes
SHA-256: 9d3b76bb3d5144247923f8e4b0a13fa3f68da087b9ef7f65c238311677bbdbd9
font_02_sfnt_off000122ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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