Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2ba4fb8e9547d4…

MALICIOUS

PDF

95.5 KB Created: 2021-08-26 09:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41b33630ac270592cc24aec280c5f7c9 SHA-1: 6f0036afc08745d91b828adbef8d362dfe534ac3 SHA-256: 3b2ba4fb8e9547d420dee9c3a610a18854d12e772fb39ecc38b0de6b05f778ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://woori-tour.kr/FileData/ckfinder/files/20210716_A195469942618422.pdf In PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d3eea76b1d---faliwubes.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/15443792729.pdfIn PDF document text
    • http://salespate.com/userfiles/file/70766967576.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607745dd54964---67468671949.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2803b406dbbe415a5ccbd1e7fb70e7bd/15215306830.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8fpib7j82t635fm0003ntvj20i/xobigikorepuzezitava.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/82604905263.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/82906953470.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/miwagoxutozo.pdfIn PDF document text
    • http://phongkhamtamthan.net/uploadeditor/files/xevimuwatatosofite.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/80628579222.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/26423471130.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/3835607357.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c06e23115efc366b06950295b747fc0/27478166347.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132e117879---fesuzikonalexenedib.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/29387472727.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/mebixo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945bb78b5a4---gideliwoduremamudilikuzo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/42537598816.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/66666688092.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b200b21d2c1---81124867385.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/18m5g4194ssb4bfqc9i228jmhb/48760693299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=happy+monday+good+morning+quotesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16412 bytes
SHA-256: fc46b189295b8b13deddc2d6b3070cb458dd2ee2610aaadac1626bdc24116bc7
font_01_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 11040 bytes
SHA-256: c1be3cdf66efdf9bb43d16c337ce3cf1d497138edeeadc2fabc767e118c1702f
font_02_sfnt_off00013fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD7 16244 bytes
SHA-256: df3d5d807150dcecb36af8a85f7efaaa60cb7f6915953313d0f17347e181acd2
font_03_sfnt_off0001559a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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