Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf581dd2a14e432…

MALICIOUS

PDF

84.8 KB Created: 2021-06-27 23:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50a4c8b96fa34357d4c18d8ce1f6b282 SHA-1: 08cc1f8899151d3eeb5909d1b438a30f4ac5a6a4 SHA-256: edf581dd2a14e4323cbfd29da6805ba591743862f6596ba6e5d31f9781abd9ca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous links pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users. The presence of multiple distinct hosts and the use of disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3854c19de---terorabewa.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4c331bb8e6a167ff29676fe5abb1420d/43284781852.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931c7b7f614---levinudolegufijelufid.pdf
    • http://cleangroupbd.com/ck/upload/files/21407326922.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2ab8939f3cd0463bdcd413b49a3c34be/lifobegazivuke.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fvtoq9q1cmr4a12n26o6515dov/93345753134.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f15a0a40fe---filaxoz.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c972025---ditawubidalugajupen.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0974ca8abde5b0c7c38291010900d9bc/80617682496.pdf
    • http://colescastle.com/clients/875019/File/10102713964.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce51847c5b3---xufopetuzatomito.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d3eac4f5b---zodibezonelabexonopopovuv.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b5b3e01dda7f91f7368fe9c93073bc25/13441465550.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sdqgjm47mpo99ohac3051875qv/fexuxojifofinumazu.pdf
    • http://kanstm.com/ckupload/files/60692508278.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/60b68b6ae3346d30b421c311ee3c9811/gemesirikulil.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160848533913f7---febunudilorek.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/daujmknu536rrdnbk0oe9ge320/nudezupebowomowo.pdf
    • http://cl-metalparts.com/d/files/pusutavanotixikuvuruxedeb.pdf
    • http://nordicaluminium.ru/userfiles/file/38223275565.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772df3b3c8---40905070226.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0927f9496b---69113076147.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09e7c42d6---rujibopozaxakibejuve.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/813a1af2fab0265c876aeda21ec8bfb6/56890384135.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a289c11ff1c---boravukedukito.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+country+songs+for+first+dance
    • 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_off0000e990.bin
5971d45cd517d684fe31600ba4efec4f8b0b9930e0ed77a257ac5c10a959ba22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10872 bytes
font_01_sfnt_off000102b3.bin
91e20b6b697703639d51ce6162c49a9eb4c645a966b7fdea31a897ded652e68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 16688 bytes
font_02_sfnt_off00012ddd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 16792 bytes

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