Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdb5832de97afe5…

MALICIOUS

PDF

133.9 KB Created: 2021-07-30 05:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 19cbbfe42c7b009359ce3d3fe1249df0 SHA-1: d2bbadbc22ca052bd4e764cf9fd59948973934b1 SHA-256: 8bdb5832de97afe5bf0b1e0eaf50be14ffcca55a0c89dd4ab4068137e086480b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous external URIs, with several pointing to compromised CMS upload directories or disposable hosting. The primary function appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=waqf+manzil+in+quran PDF link annotation
    • https://mclarenquartz.in/ci/userfiles/files/wewuraruneramasulezujam.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/32228956168.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16080355da2558---juzigigis.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/38434240782.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/55285560082.pdfIn PDF document text
    • http://cartopack.com/Images/file/tazapu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e251cb6942f58ac509574dc10c04aef3/gekegolomizumokejomi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nrt0c0obh9c6bdfujsch0egev5/ladaxevufis.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/gokubak.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/favujafilumupi.pdfIn PDF document text
    • https://emmaushuis.org/pages/56431383925.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/53959951040.pdfIn PDF document text
    • http://tipiland.net/upload/file/pemajenixugefaxavewalu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b32bb6609---80402056862.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/mekuwefineden.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/p51j605holorls60hk3g06p1mn/40480310663.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/59206902924.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b80aa75a045c7540c2d2795de2ec056a/78091703475.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///99066122512.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jm07uk99g1bfkv8dikgirek2rd/foxakuzepex.pdfIn PDF document text
    • http://accronline.com/userfiles/file/fatiranenusawonekabowamu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2f8k5th1gt984v9f6vm371b04/48032401223.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zimuganamutodogixiri.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00019c70.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19C70 35340 bytes
SHA-256: e37cc8b5aab3feba045a161933a7a023f65cfd6932ac96e185a28c58b803afd6
font_00_sfnt_off00016c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3A 18516 bytes
SHA-256: 1b41eb43567ab20b48fc3c7c5e5192b5f277be9d4ab834ea9f5e3be76c5e3050
font_02_sfnt_off0001d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1D5 10156 bytes
SHA-256: 9d74e600020eaf6e48a02630a0017a2e8b35bdae7f81a17a93c5af4502a9d3d7

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