Malicious PDF — malware analysis report

Static analysis result for SHA-256 a413c3bb2892c9f3…

MALICIOUS

PDF

87.1 KB Created: 2021-08-05 17:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aebfc3d4253f7bcff7b2297956383f0b SHA-1: b12fe7a629f6bf77859d13635f820701ef83b96d SHA-256: a413c3bb2892c9f3841a0206636fdf46a90cde21f85f457c1c6f19d5047e1f24
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d0e33d36b90a91474264d1286da2face/nabipijelaziv.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610062c30d01a---90294937824.pdf
    • http://dataction.org/demo/dataction/media/naguxipexevarafaximobali.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e3d56e3a56e90a93a56aecdcfcc620c0/35175857493.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072014da1365---lopojomasiwesakevoriban.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b7ad694b1---7987137876.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ee763ee8813d3ca67a25ae050eff7754/54114544587.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/52366429336.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100513964888---48096156244.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb52b02dcd---segevulemowopi.pdf
    • http://ks-puyuma.com/CKEdit/upload/files/defawenegegalanavojiker.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3225acb688---dariliwawuzipiroru.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvebuvdt1s6iq4nmafcdd8c5j5/fisimaxomimimakobawor.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd94cdcb0---nitezorewi.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec75c9b81---zejumixuza.pdf
    • http://africa-emergence2019.com/userfiles/file/vorujojewilutaworavuda.pdf
    • https://bititechnika.com/uploads/file/pizewimitotinatomuxeselum.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160721902a7d0c---roruvekinugafak.pdf
    • http://bjjiffy.com/upload/50984632590.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6emmn7krhe12rbve9pmlo25rqe/13119764032.pdf
    • http://twilaw.com/files/files/wimaderipelubuxurivumu.pdf
    • https://jxloanchien.com/style/postimage/file/64932098215.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0074aa96de---nowexuvepud.pdf
    • http://fluellentrees.com/clients/58222/File/gelidejofas.pdf
    • http://altinay-law.com/images/file/wimupovagoponok.pdf
    • https://kermiradiatoriai.lt/images/files/35014013429.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ices-003+class+b+price
    • 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_off0000eba8.bin
e7afa2d42a586ecb037d1595065ce6bc111dea268eb2368af729ff554cb46e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 10464 bytes
font_01_sfnt_off00010362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 16792 bytes
font_02_sfnt_off00011b74.bin
c6a397e6202e1266d65ee348828369687ee495f37686b8e55770ae9f8494b8ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 18768 bytes

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