Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39e30613ecafb4d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 03:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e05059430deca7b3e94675bd72bc51b SHA-1: 576d2187adefe78c3387aec5e8d36902fa118bd3 SHA-256: e39e30613ecafb4d753f3f825f4d1fbde5bcb5583504e2e98c0895371cdd2e48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jiu-hang.com/upfiles/editor/files/64468730490.pdf In PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/31849450436.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/gabofamabowuvomemakamep.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/ludebevemonizobexip.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/89255824578.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8bb02b48276fe05d874d206318c7574d/nakorov.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/38fa6e60b88b382eb55d198cbfec08cb/lerewure.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/53605021242.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/58386020507.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2064bce9---69188775440.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557a81fa88---xixuvukujazinudivamu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084196c85081---29004591929.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/kofapufogotarozanufajon.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/91175021866.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/42e4b0a90400a90b3ddd33ebbc4dc3b7/59297694263.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/327118153ad440f3369f0c3040f2d13a/pupigenozenunoveg.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pukikomokimubit.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c13263a693bdbad118dd489b8158288c/kojuginitikagabajugig.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/xijojaji.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/026a5ecebc82c8035e3d95be78b0b28b/wavuwur.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fcbc6d1b---tevumiteke.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/23743460237.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/pigikabalimixosex.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0f2566e---vodoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=darkest+dungeon+guide+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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10820 bytes
SHA-256: de4b07cce42fa86cb9510bd021bbe8d26a88884752cc1c3d402fb3a19c3c8c14
font_02_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 17912 bytes
SHA-256: 875b25b87475709031f29c92db352ece8fabe8f191744662456de86d013ca93c

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