Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44d9962ade75334…

MALICIOUS

PDF

73.8 KB Created: 2021-10-04 05:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 61524aeb7999f1e2b0687d6867a86a29 SHA-1: 91a4d32335c96a5a2c44f63c0e4cc7c1677103fe SHA-256: b44d9962ade7533443c9074c911de259a12fd17148daff7e4715e6a88ecaeb58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. Multiple heuristics indicate the document hosts numerous links pointing to various domains, some of which appear to be compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://techielingo.com/fck_uploads/files/mefexaropadijesesu.pdf In PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16151196540862---74390209310.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bejabapadede.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/ganuwodoxeleva.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/rakusotut.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151f9adc032a---dozufafiwoforo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kumosevagiginedavavisuzoz.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/42228d15442b0c21acee1299cea18238/kebevejumobutore.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/ef593f9285e7b105ce05383cf35075db/13822038054.pdfIn PDF document text
    • https://partetesal.ir/data/file/jokiduderukomatunupeja.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5fa393eb1---badewekiguburubojovarabo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158082d1f920---61959508453.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/gowosuwakajagaxigukab.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/pilokamolewobituxivad.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/70115250888.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/78712321159.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/nomareboxiz.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/88405054993.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/gexadon.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ce88fdc3---vuterasujatefadow.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/9561433401.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/fosusujoviwavawijow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=another+word+for+physicalPDF 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_off0000b7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F1 18828 bytes
SHA-256: 734b0996867c08d124866568d4150b4c89e28c71b432a01bab803e6693023b50
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 10896 bytes
SHA-256: 490da53ba19349a2c03c6faf161ed1c141e7b63bd147b24a964a255719a2589e
font_02_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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