Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbbc00d3743ef29…

MALICIOUS

PDF

92.4 KB Created: 2021-09-15 15:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e25d311c5fb7ac3c23bfb614be675501 SHA-1: e8c09cc76a07a729781a91a753d898a53e54fd14 SHA-256: 4cbbc00d3743ef299ec7e745958664b07dd15e4029aab681ea9cae946de0c608
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, including compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://pevak.info/UserFiles/File/nanederewarofun.pdf In PDF document text
    • http://unseretochter.com/images/file/13639343329.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb685aacae---zanuxit.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/wobakor.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/navibibumaseposa.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/27593385289.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/tixijejigobijimupulip.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/5505904393.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/xiwapuxisuxisowuxapa.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/bazenozobodiragipow.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/62153415974.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/98478522744.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/79495660557.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a148a5721---maxigabupujijugatudu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/tofodiraruvod.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210905115205.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51887352757.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/rigozu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/mivirazopovarer.pdfIn PDF document text
    • http://chinazzjx.com/d/files/27114407415.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/42179597702.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/mufojupolarufutotozu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613256d37f9ee---gonaxuman.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/15874128193.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/momofazevum.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/dofisam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+apps+to+install+on+android+tvPDF 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_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 17780 bytes
SHA-256: d4ffd7402edbb3191cd864bf89d08fd5e4ad346b94c5462b6385bfed8a718cb8
font_02_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 10504 bytes
SHA-256: 6ad2126457a0f1b714ffed12887ace6103970a3a511834498831ba77214f6941

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