Malicious PDF — malware analysis report

Static analysis result for SHA-256 d339c5cb5cb734ab…

MALICIOUS

PDF

139.6 KB Created: 2021-09-04 23:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c376712b0c26af52dcf5bd36df9389a SHA-1: 50c0c3edfde087d5b6b33767ca3f836b999f00e6 SHA-256: d339c5cb5cb734ab3402ea476e6dc0d777573bae56a183e6c5ade7c938e4bf09
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://deurenhanger.nl/userfiles/file/62889926188.pdf In PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/pokoroso.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/96060240902.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8110c825bf---99319923841.pdfIn PDF document text
    • https://limsurdua.com/contents//files/wakufomebuga.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/tamawexuvibepiwiwuv.pdfIn PDF document text
    • http://learningkey.org/userfiles/zelaboxokalefitimiw.pdfIn PDF document text
    • https://seerupit.dk/assens/file/60675294376.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/46112987393.pdfIn PDF document text
    • http://upakuika.com/img/file/razajesam.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/kagivikiwupodozefifizo.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/93738235911.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608748639817e---duzonuzedejomivorafudiv.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/23614542114.pdfIn PDF document text
    • https://etimes.mn/uploads/files/6311412944.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/36818643610.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070814c8110d---zakijofuviwojabonewa.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/9684654796.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/wamakovojopaf.pdfIn PDF document text
    • http://dentherapia.hu/files/file/32278619794.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/pixixenixulurejuloru.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8df7d2d289ad50e95bff742d11c9466c/zawobabux.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/7848291777.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c47b8ee2---23934291406.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/somazuxus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nuova+simonelli+appia+2+manualPDF 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_off0001ba2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA2C 19828 bytes
SHA-256: 2c70595461b4d9f016d28f1612058b48dbf4b7eea3bb6cd46111e763d45bc1ff
font_01_sfnt_off0001eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EEE0 10476 bytes
SHA-256: 95326e7bcf115cbc7c8fcba1a9a654c4b076e50a69c8848e2f69b3b132209afe
font_02_sfnt_off000206b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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