Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba00a9a4b28e44b…

MALICIOUS

PDF

90.5 KB Created: 2021-09-06 16:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19c3d19d2282a0b281a0d01fd88ced3b SHA-1: 197eae8a12c4e1cf553e0b33e44eab93f761e4ec SHA-256: dba00a9a4b28e44b5b8155043076b66768077d5ec92c69b58571d9088ee8a42b
156 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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to lure users to malicious content. The presence of multiple links on compromised CMS uploads and disposable domains reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ecohort.com/userfiles/files/tuparemeju.pdf In PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/49984503003.pdfIn PDF document text
    • http://93564497.com/userfiles/xetexu.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/31393524750.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/21340388240.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kirudobebarefo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/97shlkcgvd29ld0h6eramcnqm1/tilosenaguvafebofen.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/dalurusowosokaleses.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/28132213187.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/89402464768.pdfIn PDF document text
    • https://ecoretras.com/file/zegezedovajogovoximip.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cc69688df---37235817399.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42ae57a392---mojisibazekuvaxusapu.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/dojujogoli.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/da6972c34fbb1457eddca165b4c36a7b/64280676936.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/zafebabig.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/78442827850.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/84768544663.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/704e9fda2d05820e3e1d1a0e839a21cb/vosezutavatuxisitumovomum.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/60389086552.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fe30505f2bb---53815208028.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kerubaxaxetevafovanodut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=2004+chevy+trailblazer+manual+pdfPDF 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_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 18004 bytes
SHA-256: b9f4b4f1b023bb11ee2feb05d28f13355bce7875831a240fe6ce5c86f093379a
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 11300 bytes
SHA-256: 10b3c63b1db09f923d993ab824aab781e68f2333d751c6522e75e0ff16e9ed39

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