Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea8b46df4626cee…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 08:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a1a4961148e549a2bd8142291c90f82 SHA-1: 22ead41f5a1669ca05b5cdf29352b95004c07589 SHA-256: cea8b46df4626ceed8ad27bc44c6e28d5ec0cf4df09507c3109119d989a9fab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=proxy+tunnel+apk+download
    • https://karapinarinsaat.net/userfiles/upload/file/41773669278.pdf
    • https://al-farh-iq.com/upload/userfiles/file/22241641083.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4ad36f7b---31261009215.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1736b62b6391ae03e362956121a419b5/topir.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2f2b7a4c---kejenesitajubi.pdf
    • http://nesthomes.in/userfiles/file/momawurasaluzaremotasiduj.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afd05c497c3---vivanuxumibenaxabixijol.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3ced0b924---43282583985.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r3k7q89anqko7unarjo1jsdtet/44489604226.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9da65ae9e8993131cf4b4efa0ee256d6/lamezifogo.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ba32012c383b44582ed21ca5de533282/mebel.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda788cb8d6---90064420978.pdf
    • http://yangpupark.com/uploadfile/files/pojotugoledipuputusekam.pdf
    • http://poltinik.ru/userfiles/file/29833030071.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35fdc42d7---90055364353.pdf
    • http://ytbozhuo.com/upload/file/182257515872.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vks6d1t8h1v10f6m62enfgqv04/dilusemadagojenuwulito.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bdd060ed---81643871591.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7ad53c2bc81342d37051d25214e1166d/55169452742.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tajuzi.pdf
    • http://jonkmp.nl/img/cms/file/zivazudas.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/0gk65fos0mqpvaje97h84sah7r/kizivuberelodirewinux.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1opc2kj5c064va5el8kb4cik6n/91919794479.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0154c53189370a6d4be36a0bc40ea150/tumedowuvofuzexaju.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60A 16792 bytes
font_01_sfnt_off0000fe21.bin
f253d8cfb0ad0faf46936965c4dbde35ef7858948f8ddbe54b835ecb9d9519af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 10620 bytes
font_02_sfnt_off0001169c.bin
85faad1c5312a80f26a538a354ae54c19e0556b4b14cb306e70af1b21ee95cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 17580 bytes
font_03_sfnt_off00014488.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14488 16092 bytes
font_04_sfnt_off000159c4.bin
0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159C4 1668 bytes

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