Malicious PDF — malware analysis report

Static analysis result for SHA-256 141574a0844e66c5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 08:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cd832358d7e7c4310635f8d481d971d SHA-1: 30c55d23add83c46b34cef742dc23d3d372bcc52 SHA-256: 141574a0844e66c5f0a76abf43134b7d09208adee031b983beb1941f91c0c64b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm structure is a common precursor to further infection.

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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2908aac268c66c8bdd2262d00ea8590/20205700252.pdf In PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/rigegepozevuzefijigenuw.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/79856894628.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/39222354405.pdfIn PDF document text
    • http://hocomesun.com/upload/bubebowenunefegimewinoda.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/jivanaded.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444794ecd9e---82204279414.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/9386990193.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614526e9041c1---nipefutive.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4009de35501660e5ad3e9a98d94ee823/35658804367.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/64f71680a49e147defd69aa052f87889/42815063843.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/vuxosotafimotogopa.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/wifoxofesinufubugowijiz.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/46645560157.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/10300699188.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/44609308666.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnva3h3i9hsklr918b656nl7cu/92631700762.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/kumexexomavoxobeteba.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/32048039103.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/kegozutulifewemutoz.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/73685573670.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/22701965822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=candy+crush+saga+unlimited+boosters+apkPDF 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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 11440 bytes
SHA-256: 8ee63fbb4a0a5a5675c0f63fa721230374661c035c1c5e9a32011a9f3ccfb21a
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 17384 bytes
SHA-256: 74d53e362b952a544e1887cb8ed45c695bb46ac3d9ecbfc13744255272d5dd46
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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