Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ba9d2bc4449063…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 07:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 649db67d8a432d01d0fd52aa0cdaa588 SHA-1: 8aebb612f45f8a704775c60ebfab416704da8115 SHA-256: 46ba9d2bc44490637f077aef07f87103f22656c072698de3bd4f10b788217ff7
156 Risk Score

Malware Insights

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

The 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 many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body was unreadable, but the presence of numerous external links and the overall detection profile strongly suggest it's part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bistakalikotenetwork.com/userfiles/file/77092984178.pdf In PDF document text
    • http://entryexpress.online/chapter_images/files/4555109124.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafd65ea463---19700286440.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/365756664.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ifbur0mslooch091ttm6jdkpd2/43447770254.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/vosozenaveziwogekawafo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709453722a8---68718284662.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a268b4ececf---menodadutilumebujodojibaz.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zerumakepofigifika.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/51060229709.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/zabitemise.pdfIn PDF document text
    • http://minerva-collection.net/files/files/22760136980.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161007b001020c---79720619321.pdfIn PDF document text
    • https://cakkue.com/contents//files/63037529526.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/63e6ad2abaacd9b8cabe855b075304e9/41593309807.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zezagetu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a38d9dc1---mowetak.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2ecbc7b49f29b941860b9891a0981434/24937044640.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/gupababazote.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210814121249.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/maweledabimejutoxuxo.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/46527774178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=auditing+risk+management+process+pdfPDF 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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 11088 bytes
SHA-256: d5fe7c8bc292a0acd2c80b8f40fac000bb9981fc0349aa4d70d5207eac0fe751
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 16696 bytes
SHA-256: c0f26098a39a6427ffedfa297b9129ce6a980ce34b82e7294f5bb01c3f0eeda2
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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