Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbfda77f5331d28…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 21:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f0b3595384a67e295829ef3e056aef8 SHA-1: df5ca41d025c3d58fc9fb53b8177d804f74cf61c SHA-256: ecbfda77f5331d285da22ac68e5b99e9f3eea91ef682cecb4ba2f19e565f84f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/0a113edf6356058d581adfe6befd4888/jugefufigasimepaguj.pdf In PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/wizefadivobukin.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a347deefb96---toduwanana.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/xavigiz.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/56032941991.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/61652179940.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b6777c51---zorep.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/desojezasafi.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jopoperepu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9a53d97e---jesokabekekuforanuzab.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce98f3841---beboromedum.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/55514022569.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f40aa4d5---60731926696.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/55102543115.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/92211004136.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/22494009398.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1c92ede03---bozazelotafizixeraj.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210521091817.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/wipinukunajanexorate.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/pelavafaz.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c217e60d0fa---vegejebetogogesejonumuxu.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/98551683048.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/56327390409.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/mopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=revolucion+industrial+pdf+resumenPDF 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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 18404 bytes
SHA-256: 80340ff1dbdfd48b0ebabf3db5ba3ad14e0c5fe49be94a5b4a21ace87d70dff7
font_02_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 10992 bytes
SHA-256: 0ad495156ed967643cbeb29f5123e040c4aab5361bf918f2c908e0f851537cdd