Malicious PDF — malware analysis report

Static analysis result for SHA-256 68406dc0f3d9665e…

MALICIOUS

PDF

81.2 KB Created: 2021-08-05 05:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f398e84ef8d169bd600d84cf9bef718a SHA-1: cbe24e69eca5df8635604057a4fdff061690c43e SHA-256: 68406dc0f3d9665eef5e4cbf9e9bf0d4b3c8abbf765915508fa9ac910a659da8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gionggiacam.com/ckfinder/userfiles/files/puged.pdf In PDF document text
    • http://ahlhy.com/uploads/file/181707032251.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a539f3b4c4---80234374850.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/bodutifuwuzoriwiwupiwa.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/xagivovunezajuwe.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/74390383011.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/wurovuwuf.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/nurudoguxanibenet.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/22475295401.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87afe45d4a---nusupuxigepika.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6852ff2b7f0be8f132860ec8466e33ba/narakise.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e2585e472---83745361239.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a2e3effc---mimakemelogotenegikopota.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb272b8ec6---13713232827.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s4640e34nhh75mvsmdnqg4efao/7241532584.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/40085917668.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/veroripurotodew.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e48dc715a---gopopunewobe.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3ct7gbmfub0u6ltp5da92q3896/18105101632.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/35890119556.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/19633554723.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5c8u6ancm50ina31vbjgvi5p7t/dolasilomitulan.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/wobawalokazikesafuwi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c788af6eed9---nezexesamujekomemujuduno.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d67330682e42aadd90d1570caf035cda/10763062418.pdfIn PDF document text
    • http://julianina.dk/upload/file/jazes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+devil%27s+arithmetic+gitl+traitsPDF 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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 10656 bytes
SHA-256: dbdf5cb0e74e2618c771ca8c28dc965d4ef27e4ee0d4c698a68107b9f0c13f47
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16548 bytes
SHA-256: cd7e7b14bba4ee9dbf9fd40005362e0d5bae543472a63f1ce719f125269f0c30
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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