Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78df1c3c2eea7f6…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 02:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffe4e932edf82057df4f62c715d2524e SHA-1: de0d49e0ca4d56634d08f565c691cd5aeb27d201 SHA-256: b78df1c3c2eea7f6bdbac3b38f1582ab4bb2edf84db2e77adeddbbdc29ae0b0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=tollywood+most+beautiful+actress
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3cuui1v49ap2bt1e4vekvp3jae/kibuji.pdf
    • https://armagedonspedycja.pl/files/file/vasukididiteroduw.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/324585eh38u1da2qqt1jr2qali/kuvotiruder.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608002682337e---lofunoxuliwazinil.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5257dacfc61a8885edb165f34c0102b9/66092328021.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f32e49031---zisasapef.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/0ou4tau70d4vc80mt8nhfjn065/12927049491.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0080c335d2---sosepefuferebeda.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fa97378c---xejitazuwaxejukoz.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9dfc64003---lomilonada.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8713ac3604---70681277783.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba1141ff8---ruloj.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83710c54d---wufuzowaju.pdf
    • http://carszana.com/image/upload/File/tifunuduzamatojoror.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5eafd8c1b---22211163764.pdf
    • https://b2cexpressdemo.com/userfiles/file/wixelodizeze.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e7c4d18a5---91171964597.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866dfed230e---13143050695.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1a74c67ecd082179efa94efa3bd6d80b/xuleruwigesawavaz.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/nt657deg0fuf3tl7pubrin3cq6/fikamujesudizolum.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95461b5927---49207232958.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f056b763966e082844287129732d976a/ziwarokigotozezaxu.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/52661069721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bd.bin
5b0cf2d5f742034e5e2e289c896ae7bbf90f997b367f4c8f59f4595abaa5590c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10936 bytes
font_01_sfnt_off00011331.bin
be17819ce8f7d5509555ad459a940dd436a89c33f4aa1e61e7e8cbea05abd8bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 17620 bytes
font_02_sfnt_off00014129.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 16792 bytes

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