Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06bda1f0aa7c7d6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 09:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34f4420fb64ca6f2bc002f3fdaee851f SHA-1: 9b3cdfd42ab122631e4d0e556c789495bbc0b301 SHA-256: f06bda1f0aa7c7d6a45895ac0f8eb7c73bd325eeb6b49c350bcaaf205b5fac55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c97a4490aa96f542417a700c8c0f3a66/forafunos.pdf In PDF document text
    • http://archifolder.com/userfiles/files/46706190982.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305f0c337fa---gitenamikurapeg.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/7237511510.pdfIn PDF document text
    • http://momsystem.ru/public/file/pisogilevovedeja.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091118174173499.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/jutonogezarunazakolo.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/10407352294.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d258576fa7---jowutemazudukatadopad.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/katifezasirakanoremokurim.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/88900546370.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/47600766382.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/89021943691.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zofepamajotuvutivege.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/lukenogajaruzewika.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/3621709125.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/mogaterox.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/58554690209.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/lupotejanifigebumekine.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/tusejizufutetif.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/75167487675.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/26947337754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=plot+and+structure+james+scott+bell+pdfPDF link annotation
    • 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_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 18968 bytes
SHA-256: 9b711bce6bbd327ac2f6ea57b7ead355986228ab0523f74be45baf85c0d8c34b
font_01_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 11060 bytes
SHA-256: 1b2fdbbca0e4ba8945e065b5cf568614446048f815aba3431caa934caebaeb7f

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