Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eed143bdc9aab2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 11:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e9e992e429c86253644c6cc3a623f27 SHA-1: 6272b2d3e62391468b6e82c6c5fc95542314e1ba SHA-256: a8eed143bdc9aab23b3070d3f561de5f5d8c43b924ba8c0b281adf6d31539cab
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for malicious purposes.

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 https://crysiq.ru/uplcv?utm_term=android+security+test+suite PDF link annotation
    • http://fuhua.tumujike.com/assets/upload/files/202109030316371086.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/nosomifirorene.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/48756444226.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/rijodadetegozuwaf.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/64508735183.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/67495601945.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/wasanobu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/68603552842.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/lixapu.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/45284698675.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/69815285883.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vaxelodax.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/50036436711.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/3450773676.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/mufujifobisonof.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092005313985.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57468b983c673ab665aa3586cc013797/33000930044.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xebumobigewapupewiz.pdfIn PDF document text
    • http://kechengchem.com/upload/files/rosuvowizame.pdfIn PDF document text
    • http://yibetter.com/data/files/89760077396.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/xalus.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130963d05773---dizasurudirapulidedo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/65122163517.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613548cb0adfa---68154979644.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/vegibu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 17748 bytes
SHA-256: f17243ce5f1fa4010e37ba7f9290c75cd433ab3c05791b072749e856785cacac
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 10352 bytes
SHA-256: b251cfdaf9bf69a6f0e64a425764129c9b395b9002cbf6e33d1e9dbbf57a8f15

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