Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c21e9bd65bccee…

MALICIOUS

PDF

97.2 KB Created: 2021-09-01 07:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92d455d1c0b1f19028bff1c22a1d9da6 SHA-1: e598b427fd775524e70a0a0c95520794d1e10624 SHA-256: 98c21e9bd65bccee2b99f02309f7080ebdd21ea96300ca7d3b58309ac97d74e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9ku5lvq8gh1ml7fsb3gqbo7296/66530388265.pdf In PDF document text
    • http://hotelgiottotorino.com/userfiles/files/94580579536.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/lagosometiwelejetogabal.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/texoruzonibifutanojumupus.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/345961053.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45657aaf5---vopojuvubuxirurumoxe.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/guposatageramin.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/29357608222.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/97756635535.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f4346c65981c579b39a65898e8fa0baa/sipugugepojapoxebuxizav.pdfIn PDF document text
    • http://fu-xin.tw/uploads//files/202108091110519830.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/e3dm5nvgqr0q6qmk0j2s3qc8gi/91519979908.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/tefif.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080673aba55f---jazuvovexefalonegid.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051072725_46054707.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b6155736---vuwaxokixinatuweposopi.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rubozizarufejikimagilaluj.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/siletam.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/7593187281.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8310b75a---raluparisago.pdfIn PDF document text
    • http://fivesteps.pl/userfiles/file/visiv.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/31b893ff67439f96be17ba8392217d57/91235839732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=have+indirect+speechPDF 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_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 18684 bytes
SHA-256: d7d92f9cdc9315d6cdc3119839a09f41a19a679de4cb2c06a317972f52b08889
font_02_sfnt_off00015f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F69 10500 bytes
SHA-256: 100360aca890cfe06a3cdcfcbf36c5f794e63077b96dc092a9d0d56d464f6292

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