Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2ead8eff23b86d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 01:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ab59765282860e50c8ff763fe74655c SHA-1: 7859f74c2233daefb2bbb1942bdd692d6139d209 SHA-256: 3d2ead8eff23b86d9eb0de4e49010cd8958eef48babc07a410d7d31a8599e351
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Furthermore, it exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The presence of embedded JavaScript indicates an intent to perform actions beyond simple document viewing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://alptw.com/images/files/43955684397.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53184991780.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/79221538658.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b232a3cc4---74200285966.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/57052597249.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/lubakobuvogolewu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9a5085d194acb36866cb9c731c51dcf1/30486106199.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fosivawawuvibafa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d7358392e36b7e6a7875b226df81d749/86282016673.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ad13ea907---94024430099.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b97bcb1d---90947350765.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096092b8fde9---80201118249.pdfIn PDF document text
    • http://lnyy.cc/uploads/file/1630421579.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/zopigimerusafewepawaxukow.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fdfc02b97---24084959470.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-21/20210521005218781364.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/salipujimugi.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/rebivonojavirisodeb.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4d619a993---fewawitupadefutujelowopa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vujabivexexeseb.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/07434a05a6e5d0cb4371d581153c976c/68117673903.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e1128f76---xizetajodafivov.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/bowaf.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed06a021e8---47761700092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=conceal+in+tagalogPDF 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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 10168 bytes
SHA-256: eaf9b16bbfadfac9464d7d244b1ea03b0bff0971f1b3618789b6084c896c14d9
font_01_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 19200 bytes
SHA-256: a246c07ec6ef987ca524373e067b8ae4b6283f5f8739b3ba5d163d8ae4629fde
font_02_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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