Malicious PDF — malware analysis report

Static analysis result for SHA-256 9552031a7f184367…

MALICIOUS

PDF

72.6 KB Created: 2021-09-30 20:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 17772a4ed3830b83515016151c82361c SHA-1: c06c70d7d343aab83642510660da8d9ad4772141 SHA-256: 9552031a7f1843673419f42d2a1998fbddbedb45a4a91b93e00d23eac0ef5813
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links, many pointing to compromised CMS upload directories or disposable hosting, strongly indicates a phishing or malicious redirection campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 http://camelliafb.com/uploads/files/202109141801053768.pdf In PDF document text
    • http://giadinhlaurenso.org/upload/files/divitizozoju.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/torota.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/73486053501.pdfIn PDF document text
    • http://smogy.ru/files/files/65968437769.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cda2337087c71651f2902fa5defae643/14085964702.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/68220307306.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/bugikewuk.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/69835268257.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/25367560255.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/eb7fd6c5bf9ec46ccbc26b5df92c212e/30918076802.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/53497973641.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/roxafoke.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/47806844351.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cd523e7ab7e9c24f32d5bac00e12a2d8/bewibawasedonisumekona.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/316662130.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8730128243.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/89296021676.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/vudefuriwomez.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/58225642536.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/lalunobis.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/39891204845.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/67847151083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+learning+station+7+days+of+the+weekPDF 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_off0000b52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 10940 bytes
SHA-256: 4a806d93638384a2e599f63bb5b8a1a75f97ed2a533b675824a3d21a0dfafcf2
font_01_sfnt_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE679 17912 bytes
SHA-256: 8b38f733209b7a976d61363ca2502b7d440f22d069bf40290cd9de4a7aef873d

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