Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4e311844ce577e…

MALICIOUS

PDF

110.4 KB Created: 2021-07-08 01:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e9052b2b02633738efd6c56b7a1e192 SHA-1: cfb48ec2574e0ff7fdd484ef6ac06b0ef7613f96 SHA-256: ce4e311844ce577e2f80234d145d10be847f5e3ae292f7cfee86e822fd5d89f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kmob439amegkhgq8sjngtc0u08/61714734505.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb454b16ac7---zeramaxarogal.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829bc488a1d---kuliduta.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a80d6a4f---89919346161.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3da2e5663---sesoxipufevopav.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad6343d01---40204142880.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48ed69ce---domebanakukukejoju.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a10da2d0a22---zodomowonafifuxofi.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16f17f720---82931220093.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8m4vgn6vpq4r9901b55mlm0pbm/26386064219.pdf
    • http://ventilatoryzlin.cz/images/file/xulogerizuzaxax.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/34847014824.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99889beb55---zosizowuwogitot.pdf
    • https://hogies.com/includes/template/uploads/file/pixamuloxefipix.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6f0805a99b582b442fd218184e77afa1/rovezaxem.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427b09871d---55625679688.pdf
    • https://alteanetworks.fr/img/file/89228976457.pdf
    • https://transport-vehicules.fr/userfiles/file/najudidoxirumeti.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c155a0cd---vubeg.pdf
    • https://alrashed-alsaleh.com/userfiles/files/33285530768.pdf
    • http://arci-mp.fr/admin/File/tadomizorokewibawibubon.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c7fd2f6b---31105392936.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8949877b---lavaxedulutusidapo.pdf
    • http://intrinhgia.com/admin/webroot/upload/image/files/baluzeviduwufexavawazujof.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd2fc4a36---86295287088.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adverb+of+place+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00013321.bin
fab12a3ffb5da343c4e738670bfaedeb76e953a972959d8faa4a00636f3bf3be		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13321 18132 bytes
font_00_sfnt_off00011b10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B10 16792 bytes
font_02_sfnt_off00014ffb.bin
fa957812b28f3ec658e1d6af86da4ec41a76c4203058fce176b1aa02b773f097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFB 2684 bytes
font_03_sfnt_off00015b97.bin
c377a7f32073be02ce1620c3c7e23008669ee2f5eb0637e7b3d0cf4d28766958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B97 10884 bytes
font_04_sfnt_off00017444.bin
550666a545380d4ee5117b680bbca057434c2f1119dd658fe65edd5f70238eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17444 22100 bytes

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