Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ab77a269c65867…

MALICIOUS

PDF

78.0 KB Created: 2021-10-06 13:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa6f41f6ba0574e02035421b9594e023 SHA-1: 18262dd4af77cc631dd7b5ff58b8086907efc1fc SHA-256: 28ab77a269c6586721889b3efdf73198787e3073a1f5b4fbf9f5d4a07e527004
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=ratio+word+problems+7th+grade PDF link annotation
    • https://paradigma.bg/uf/file/68474394406.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9f6a7e2b1bab420563c19f600ee235a6/sodirebonax.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/2802548094.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151cd592214f---larenek.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/diwawaporupebuzo.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/90292636542.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/41016879256.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20211006153140.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc4b6b51c---88719401957.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/87035456867.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/lasudapovipufene.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913030928396566.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/95251914399.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/zabinekemegokuwikasa.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/funadaroxorodiweriweme.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/87983226533.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/fidoxilijopokamagu.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/sikelebemidojezekebusudom.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/39158547199.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/dotipemeno.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090820250673499.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fc2fc87615818ccc80ba35ec40bc1e0a/demeguludujakopefatepigan.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/povozib.pdfIn PDF document text
    • http://adriennemason.com/assets/files/tunixofu.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/fepogivaxusolobobu.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/junanogivesipibosit.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_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 11056 bytes
SHA-256: 834d9be51eb44d430b57a3a18ffca5490f1f5124ea5400249328da40d12d664a
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 18480 bytes
SHA-256: 1c9a042172deec9297310ace0746ef31c6ebc47697ac77ba31abdb7e1adf064f
font_02_sfnt_off00011210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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