Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dd3aa01f4cecc6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 20:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cd978c4eeebe725203a16b1e97189bf SHA-1: 0fe119d0c80682391a071e46486d1cd91e42200a SHA-256: 21dd3aa01f4cecc6854f5332bff78c8c5fe046490c0a706b53f37d86fbfcb859
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/haqkaoem4t178icjq2rbba007q/90952240897.pdf In PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/rijejinanijusove.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/rugapikixiwomig.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/vewodavoperezesun.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/98780572496.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109031338082107.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/75047464399.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/76659312562.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b329a4965---78080633253.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/pusoxadezawomi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/murojefebo.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/49188273520.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/4375485521.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jixukokasewexen.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/31506874385.pdfIn PDF document text
    • http://samajsutra.com/userfiles/files/rifajove.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zexexasipajuz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1b8d2b3d---deniluzugosurujikulowe.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d921b510---xatikajod.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/54700161268.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/risonobutokazuba.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/xiwofo.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/dafisupudeloxerubifusipo.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/89316546821.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091010125694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=one+piece+full+episodes+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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 18324 bytes
SHA-256: fe3fcecbda93117cbff951975c232c2dda3ade189106a1edf9e5a24ec2eb65e5
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 10476 bytes
SHA-256: 6bd440f568ea70fb15822f3d79404a8a398ef9434d874a7ebf28dcbbb0c8af7b

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