Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7f618c3d55a1c1…

MALICIOUS

PDF

95.2 KB Created: 2021-09-08 11:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ec7eadb7c5edda16fc670992c54c8a7 SHA-1: 4b11f77011480b47184b0a050bfb0f57b496afb8 SHA-256: be7f618c3d55a1c103cf5f48b5b16851a52677ef7b855c6f9bcede9c50f98add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself points towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://smidgel.ru/uplcv?utm_term=fractions+and+percentages+worksheets+ks3 PDF link annotation
    • http://hoteldazegliotorino.com/userfiles/files/56482166452.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/xifunefinupi.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/15631744823.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c518be24c9b62574b216fa9de710169f/sixarufupoxozopam.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e90f494f1---20630850343.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745be6ced9---43924256175.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/97515212320.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ff6c19ffa529fd6d11e666902ab514d9/xilowawikajituvidavewukid.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/86235727135.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/nowozilinodisutag.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/kakinewu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/tomunosegafepukifijefure.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/zezogegepejilufiduwebavo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/adbe561b05d55351b68130bc23b67f22/61326833103.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/55207339670.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/kkjpfi10pdue0eb1qmfhju6kmf/73412120767.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7a677e0062499ca2962257a12eed15cb/liwus.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b085330bd93---gatagaxiledugaxerizole.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75113397515.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rodogi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd8dcc13d4e0b7fd37bdc74e4155566b/8324057779.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/62227898563.pdfIn PDF document text
    • https://phunhai.net/upload/files/poreja.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/87524484516.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ule60tf521of5gi4u84vld6rt6/tupozoneb.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05035123d8---88494924352.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_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 19760 bytes
SHA-256: ee7195a4d6b68ff7a1b4841da8d94552419fc2e5a11c1b835ae8a4470225fd12
font_01_sfnt_off00013d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15532 11072 bytes
SHA-256: 1b42870ba1a872a3b3a3cb8ea594777b5b4cb68cab66e59a8f04a3f5b8e7c21b

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