Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd8b2dbc9295947…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 10:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee5d809622f40e62298c3ba3085a9320 SHA-1: 07e2b4c1308900be8983c5f09d540743b463be78 SHA-256: fbd8b2dbc9295947d0cc4ac35a6926243f9b058949998a0525b3b125aa78ef43
176 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.agencesramos.com/ckfinder/userfiles/files/lavev.pdf In PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/6998017846.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210901205342.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131550683ba4---38931251012.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/kovojorodefudaz.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/67386758640.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/denofunuzokibanazogaj.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/wosev.pdfIn PDF document text
    • http://sgpeo.pl/users/file/81324621635.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/nukofufeda.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dd01911e172e00103c0920c6e201abf1/22723438571.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/menopoxelowus.pdfIn PDF document text
    • https://digireg.org/upload/88669338646.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/276538475.pdfIn PDF document text
    • http://honghuibio.com/d/files/rofufekibetewik.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tovemoninotu.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/jurubazuwuzelevuko.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f2c8ad7738407a8db5219ef96e0fabfc/naxabikozofu.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/74121692559.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/fefuzuga.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/35a96ffd1e895ea02faa54c78603477f/15028672703.pdfIn PDF document text
    • https://oldgradeducation.com/ckfinder/userfiles/files/10461397641.pdfIn PDF document text
    • http://hrudolf.com/userfiles/76356908654.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/diwexela.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/butojozefox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=prison+break+season+2+episode+1+123moviesPDF 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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 15728 bytes
SHA-256: a0117d0512a1e317dbe202505ed71d106e8d35ec129a0e68aa295aca1c54ecd9
font_02_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 11052 bytes
SHA-256: 26e85a0293bdb29cf6832d82b9a8e6737c268d041f74c406f9d823b3426011c0

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